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> What is the powerbank?, Testing, calculation, explaination

x-treme
post Apr 29 2013, 07:30 PM


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Part 1: PN-910 testing
Part 2: 20000mAh powerbank testing
Part 3: Lithium-ion / polymer Li-Po (not 18650 type)

Part 1: PN-910 testing

I had carried out a test, this powerbank had discharged for 7 hours 20 minutes(4.925V, 0.945A)

i use two 10ohm resistor in parallel , resulting total resistance of 5 ohm, resistance is enough low to get the output of 4.925V,0.945A.
user posted image

two 10ohm resistor in parallel
user posted image

display show a little of fluctuation,between 4.92-4.93V, 0.94-0.95A. on average, it is 4.925V,0.945A.
user posted image

Inside the case contain four 18650 type battery, each one contain 2800mAh of capacity.
user posted image

measurement taken by vernier calipers, diameter is around 19mm.
user posted image


The powerbank in the current market are measured by mAh, of course the higher the better.
But, mAh cant reflect the real capacity of a powerbank, why?
Because most of the powerbank is using lithium ion battery, voltage is 3.7V, after fully charge is 4.2V.
When you are using it to charge other devices, its output voltage is at 5V. (USB device must be 5V)
This mean that the 3.7V should be converted into 5V before it can charge or operate other usb devices.
An example, for 11200mAh powerbank,
3.7V x 11200mAh = 41.44Wh = 5V 8288mAh
So we are more concern on 5V output, that is 8288mAh
The conversion is not 100%, there will be some losses about 10% or more.
just take 10% as losses, so we have 8288 x 90% = 7459.2mAh @ 5V
if your handphone battery is 1800mAh capacity, it mean that it can charge your handphone for about 4 times.

what i tested here, i am measuring using power and not mAh, which is accurate.
As you know, VXI= Power
Under 5ohm load, 4.93VX0.94A=4.6342Wh
Because of the measuring time is quite long, i take measurement on every half hour.
Total discharging time is 7 hours 20 minutes.
From calculation, i can get a total power dissipation of 34.13Wh,
the rated power is 41.44Wh ( 3.7V x 11200mAh)
34.13/41.44x100%= 82.36% is the real capacity

This is one kind of fake powerbank.
user posted image
(shared on facebook, just for comparison)

Just avoid this type of powerbank, even inside is not filled with sand, its capacity is very much lower than the rated capacity.
My tested powerbank has 11200mAh capacity, HxWxL: 21.5mmx71mmx110mm
Each 18650 is around 18mm in diameter
length of 110mm can fit a capacity of 11200mAh, what is the length of powerbank to fit 20000mAh or 30000mAh? you can do the calculation.

Beware, there exists of fake powerbank which is same as what i tested. The one i tested is 100% original.

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x-treme
post Apr 29 2013, 07:31 PM


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Part 2: So called 20000mAh powerbank test

i had borrowed 20000mAh powerbank from my friend. Due to warranty reason, my friend not allow me to open it.
tried some method to figure out how many 18650 battery inside the powerbank, lastly i use torch light and saw there are 6 18650 battery.
What is the capacity of each 18650 battery i'm not sure, but i can test and prove it.

user posted image

Written 20000mAh, made in Taiwan
Written 2 output current: 2.1A and 1.0A. After i tested, it is just a parallel output from same source, not separated.
user posted image


This set up is similar with my part 1 test, using 2 10ohm resistor in parallel, resulting 5ohm resistance.
Output current stable: 4.79V, 0.94A
user posted image

Result are recorded, total discharge time is 4 hour 40 minutes. Total output power is 21.01Wh, only 28.4% is the REAL output power.
Rated capacity is 3.7V X 20000mAh = 74Wh (vs 21.02Wh Real)

[My tested PN-910 had discharged for 7 hour and 20 minutes, total output power is 34.13Wh, 82.4% is the REAL output power]
Rated capacity is 3.7 x 11200mAh = 41.44Wh (vs 34.13Wh Real)
user posted image

The 20000mAh powerbank had been tested for twice because the first time test i had over estimated it can discharge for at least 5 hours.
But it is actually less than 5 hours.

Dimension measurement by vernier calipers(20000mAh):135mm x 71mm x 24mm
(my friend said this unit was selling with price tag of RM110)

This post has been edited by x-treme: Apr 29 2013, 11:48 PM
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x-treme
post Apr 29 2013, 07:31 PM


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PART 3: Lithium-ion / polymer (not 18650 battery,18650 is similar to AA type of cylindrical battery)

Borrowed another powerbank from my friend, it say it is using Li-Po ,smaller and thinner size.(diameter of 18650 battery is 18mm,this one is less than 18mm thickness)
The rated capacity is 5000mAh,everyone can guess how much is the real capacity?
user posted image

Battery inside is thin, but is it soft one, if you press it, it will not restore back to the original position.
user posted image

The voltage regulation is not good as PINENG powerbank, it fluctuate much more.
Some of the data taken:
4.77V 0.92A
4.80V 0.93A
4.64V 0.89A
4.48V 0.86A
4.37V 0.84A

From my calculation, the real capacity is only1.82W
Rated capacity 3.7Vx5000=18.5W only9.84% is the real one.
this powerbank had been used for 1 year plus, now only remain 9.84%,1.82W even can't charge iphone for half time.

For your information
Even though there aren't sand inside the powerbank, it doesn't mean it has real capacity.
For example: I opened a powerbank, inside contain 4 pcs of 18650 battery, if I said each 18650 battery has capacity of 10000mAh, 4x10000= 40000mAh. This can charge note 2 more than 10 times. Will you believe it? rclxm9.gif Don't laugh, there are people will believe this.
Remember the highest capacity of 18650 battery is 3100mAh,manufactured by Panasonic. Those who said it has 5000 or 10000mAh are cheating.[/size][/backcolor]
If the powerbank is not using 18650 battery, but is Li-Po type, the price is much higher than 18650 type. Li-Po is extra thin and slim. Manufacture price also higher. Those who sell at cheap price, you know la nod.gif

Another sharing
Anyone can guess what is this ?
user posted image
It is battery but not AA type,is 18650 battery,it is used in our laptop battery, this is called 6-cell type.
This battery I disassembly from Lenovo laptop, rated capacity is 48Wh, each 18650 battery contain 8Wh, or 2162 mAh.

Everyone can see that even laptop also use 18650 battery, don't think that this type of battery not good, it is cheaper than Li-Po type.

This post has been edited by x-treme: Apr 29 2013, 11:48 PM
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x-treme
post Apr 29 2013, 07:31 PM


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x-treme
post Apr 29 2013, 07:31 PM


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x-treme
post Apr 29 2013, 07:32 PM


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annoymous1234
post Apr 29 2013, 08:25 PM


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I just wanna know what brand is good. Might get one soon
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x-treme
post Apr 29 2013, 09:22 PM


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QUOTE(annoymous1234 @ Apr 29 2013, 08:25 PM)
I just wanna know what brand is good.  Might get one soon
*
this brand PINENG quite good, from what i have tested.

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magnumkaiser
post Apr 29 2013, 09:52 PM


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look good where to get it?
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x-treme
post Apr 29 2013, 11:50 PM


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QUOTE(magnumkaiser @ Apr 29 2013, 09:52 PM)
look good where to get it?
*
you can find in mobile accessories ...
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nghj
post Apr 30 2013, 07:47 AM


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good post, thanks for doing the testing.

i highly agree that those powerbank which rated 20-30k above are mostly fake. how can it have so much 'power' when the size and weight are almost the same like other smaller power bank. it's like saying they can make AAA battery lasts as long as D battery.

This post has been edited by nghj: Apr 30 2013, 07:50 AM
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x-treme
post Apr 30 2013, 09:49 AM


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QUOTE(nghj @ Apr 30 2013, 07:47 AM)
good post, thanks for doing the testing.

i highly agree that those powerbank which rated 20-30k above are mostly fake. how can it have so much 'power' when the size and weight are almost the same like other smaller power bank. it's like saying they can make AAA battery lasts as long as D battery.
*
yup. for the 18650 size of battery, the highest capacity is 3100mAh, but it is expensive than 2600 and 2800 type. for those cheap powerbank they wont use that 3100mAh. only use around 2000-2400 like that or even lower capacity, so it can save cost. but if it using Li-Po type, it wont be so cheap also.

there exist 20k or 30k capacity, but it is big and expensive, rm300-500 or more. this type can be used for charging laptop.
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Gurvin Abruzzi
post Apr 30 2013, 08:36 PM


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Bro what's the self discharge?
How long will my this power bank take to charge my Note 1, 2500Mah

Btw i have this.
I plug to phone n use non stop while charging, can go up to 90minutes.
If plug to phone n leave, can charge full n still got balance power.


Major Parameter:
1)Input:DC5.0V,1000mA
2)Output :DC5.0V,1200mA
3)Battery:5000 mAh
4)Cycle Life:>800times
5)Self discharger :<0.05Ma

user posted image

This post has been edited by Gurvin Abruzzi: Apr 30 2013, 08:41 PM
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ashdwoers
post Apr 30 2013, 08:47 PM


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thnks for this notworthy.gif

great job dude biggrin.gif
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x-treme
post Apr 30 2013, 09:56 PM


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QUOTE(Gurvin Abruzzi @ Apr 30 2013, 08:36 PM)
Bro what's the self discharge?
How long will my this power bank take to charge my Note 1, 2500Mah

Btw i have this.
I plug to phone n use non stop while charging, can go up to 90minutes.
If  plug to phone n leave, can charge full n still got balance power.
Major Parameter:
1)Input:DC5.0V,1000mA
2)Output :DC5.0V,1200mA
3)Battery:5000 mAh
4)Cycle Life:>800times
5)Self discharger :<0.05Ma

user posted image
*
self discharge i can't test. so i don't know.
the "how long" is depending the rate of flow of the current to charge the phone.
for an example, my phone accept the current rate of 950mA therefore 1.84 hour can fully charge my 1750mAh battery in AC charging mode.
my phone accept 450mA current rate for usb charging mode. it will take longer time.

So it is depend on which mode you are using to charge your device.
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nghj
post May 3 2013, 07:42 AM


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what u think of this one?
using li-po

http://www.myimart.com/deal/super-power-12...pn4875v?aref=DS

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x-treme
post May 3 2013, 10:13 AM


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QUOTE(nghj @ May 3 2013, 07:42 AM)
i din't heard that brand before. And i saw there is 73% why don't you doubt it ? sell without earning ? i can say the original price is cheaper than 109.
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YJYYEE
post May 15 2013, 05:15 PM


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82.36% is the real capacity..what about the rest?...and what's ur view in yoobao?...as good or worse?
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x-treme
post May 15 2013, 06:44 PM


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QUOTE(YJYYEE @ May 15 2013, 05:15 PM)
82.36% is the real capacity..what about the rest?...and what's ur view in yoobao?...as good or worse?
*
For me, whatever brand, the REAL original is the best, the FAKE original always the worst one.
The reason why the REAL original Yoobao is more expensive because it is more famous.


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brutalsoul
post May 16 2013, 05:48 PM


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thanks for sharing
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jie88
post May 19 2013, 01:42 PM


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QUOTE(x-treme @ May 15 2013, 06:44 PM)
For me, whatever brand, the REAL original is the best, the FAKE original always the worst one.
The reason why the REAL original Yoobao is more expensive because it is more famous.
*
Means that doesnt necessarily means original yoobao is better power bank??
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x-treme
post May 19 2013, 02:34 PM


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QUOTE(jie88 @ May 19 2013, 01:42 PM)
Means that doesnt necessarily means original yoobao is better power bank??
*
as long it is original, brand didn't make much different.

for example, yoobao 11200mAh and pineng 11200mAh. Do you think yoobao will give higher capacity than pineng 1 ? actual capacity only different in few % only.
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-CoupeFanatic-
post May 23 2013, 11:32 PM


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nice.

so if you were to buy one which will you suggest?
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x-treme
post May 23 2013, 11:34 PM


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QUOTE(-CoupeFanatic- @ May 23 2013, 11:32 PM)
nice.

so if you were to buy one which will you suggest?
*
PN910. high capacity at affordable price. smile.gif
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-CoupeFanatic-
post May 23 2013, 11:39 PM


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QUOTE(x-treme @ May 23 2013, 11:34 PM)
PN910. high capacity at affordable price. smile.gif
*
how is it less quality than yoobao.

yoobao is pretty good too right.

btw, why all the powerbanks that i've seen is all china brand.
no apple, ang moh brands
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foohoa
post May 23 2013, 11:41 PM


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not the problem for the 18650
it just the grade of the battery problem,
normally have grade A,B,C

those china made powerbank mostly Grade B to C
because it was very cheap and those Grade A mostly reserve for own use
they not sell much outside

and also 18650 is 3.7V convert to 5V, your calculation is good!
count with watts, because i buy a powerbank at japan, panasonic 8800mah, it mentioned 3.7V 8800mah at the back
it does charges a iphone 4 and galaxy s2 to from 20% to full, and still haven't finish
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x-treme
post May 23 2013, 11:50 PM


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QUOTE(-CoupeFanatic- @ May 23 2013, 11:39 PM)
how is it less quality than yoobao.

yoobao is pretty good too right.

btw, why all the powerbanks that i've seen is all china brand.
no apple, ang moh brands
*
that one i can't comment much. how you want to measure the built-in quality?
but for battery it is using the real capacity.
those not made in china one, you know the price.
with the same spec it can double the price. thumbup.gif
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x-treme
post May 23 2013, 11:55 PM


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QUOTE(foohoa @ May 23 2013, 11:41 PM)
not the problem for the 18650
it just the grade of the battery problem,
normally have grade A,B,C

those china made powerbank mostly Grade B to C
because it was very cheap and those Grade A mostly reserve for own use
they not sell much outside

and also 18650 is 3.7V convert to 5V, your calculation is good!
count with watts,  because i buy a powerbank at japan, panasonic 8800mah, it mentioned 3.7V 8800mah at the back
it does charges a iphone 4 and galaxy s2 to from 20% to full, and still haven't finish
*
i don't know how to differentiate those grade A B C.
of course if you buy the better cell, it will last longer, and it will cost more.
nowadays many powerbank in the market are with fake capacity. for example 30000mAh
how can a 6cell / 8cell powerbank equip with 30000mAh?

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mi-g
post May 24 2013, 12:01 AM


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off topic abit

so now i know where my e-cig 18650 battery come from.. haha

currently using this battery
user posted image
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foohoa
post May 24 2013, 12:03 AM


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you cant differentiate it with it outlook, mostly we just can differentiate
with the price, good thing not come with a low price, the grade C, i see a report that days, it just about 40% of it stated mah, which grade A is about 95%+- Grade A battery is used by samsung, panasonic sanyo those big company, while Grade B and C we can normally buy at the market

I have disassemble an yoobao 6600mah type, 3 Red color battery, and it stick with the glue stick glue, i haven't pull it out,
i planing buy at least 6 18650 to install and use it

at taobao.com china website, their have some panasonic brand 18650,
i will buy some for testing
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foohoa
post May 24 2013, 12:04 AM


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QUOTE(mi-g @ May 24 2013, 12:01 AM)
off topic abit

so now i know where my e-cig 18650 battery come from.. haha

currently using this battery
user posted image
*
wow, it was a samsung!
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-CoupeFanatic-
post May 24 2013, 12:05 AM


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QUOTE(mi-g @ May 24 2013, 12:01 AM)
off topic abit

so now i know where my e-cig 18650 battery come from.. haha

currently using this battery
user posted image
*
dafuq?

ecigs using samsung rechargable batt?
hahaha
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foohoa
post May 24 2013, 12:07 AM


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ICR 18650 = lithium cobalt oxide (traditional) cylindrical cell
IMR 18650 = lithium manganese oxide cylindrical cell
IFR 18650 = lithium iron phosphate cylindrical cell

found this,
however..........
not really know what is this
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foohoa
post May 24 2013, 12:07 AM


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double post is double post!

This post has been edited by foohoa: May 24 2013, 12:07 AM
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x-treme
post May 24 2013, 12:09 AM


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QUOTE(foohoa @ May 24 2013, 12:03 AM)
you cant differentiate it with it outlook, mostly we just can differentiate
with the price, good thing not come with a low price, the grade C, i see a report that days, it just about 40% of it stated mah, which grade A is about 95%+- Grade A battery is used by samsung, panasonic sanyo those big company, while Grade B and C we can normally buy at the market

I have disassemble an yoobao 6600mah type, 3 Red color battery, and it stick with the glue stick glue, i haven't pull it out,
i planing buy at least 6 18650 to install and use it

at taobao.com china website, their have some panasonic brand 18650,
i will buy some for testing
*
so had you tested for the real capacity for the yoobao 6600mAh and the efficiency ?
how about the grade B ? 80% ?
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x-treme
post May 24 2013, 12:12 AM


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QUOTE(foohoa @ May 24 2013, 12:04 AM)
wow, it was a samsung!
*
now i very hard to believe those.
many things have imitation. sweat.gif
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foohoa
post May 24 2013, 12:13 AM


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QUOTE(x-treme @ May 24 2013, 12:09 AM)
so had you tested for the real capacity for the yoobao 6600mAh and the efficiency ?
how about the grade B ? 80% ?
*
grade b between 60 to 80% only.....
and my yoobao die in few month, that i brought from china
they actually show me 2 type packing, at the outlook was same

1 with yoobao logo, 1 without, and the different is RMB20 only....
b4 this, it manage to charge an galaxy s2 and it about to die

planing buy this

http://item.taobao.com/item.htm?spm=a230r....&id=13485304566

my fren is agent of taobao, they allow me buy anything!

so...
want bulk? biggrin.gif
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x-treme
post May 24 2013, 12:19 AM


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QUOTE(foohoa @ May 24 2013, 12:13 AM)
grade b between 60 to 80% only.....
and my yoobao die in few month, that i brought from china
they actually show me 2 type packing, at the outlook was same

1 with yoobao logo, 1 without, and the different is RMB20 only....
b4 this, it manage to charge an galaxy s2 and it about to die

planing buy this

http://item.taobao.com/item.htm?spm=a230r....&id=13485304566

my fren is agent of taobao, they allow me buy anything!

so...
want bulk?  biggrin.gif
*
haha. so did you buy the original yoobao ?
now you are going to replace the battery by yourself ?
by the way my gf is taobao agent too. i can buy anything from taobao, can ask them how to pack also.
there are something powerbank, which can replace battery by your own. i am planning to get one to test.
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foohoa
post May 24 2013, 12:22 AM


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QUOTE(x-treme @ May 24 2013, 12:19 AM)
haha. so did you buy the original yoobao ?
now you are going to replace the battery by yourself ?
by the way my gf is taobao agent too. i can buy anything from taobao, can ask them how to pack also.
there are something powerbank, which can replace battery by your own. i am planning to get one to test.
*
yes...
i buy the ori, but...
i search online, acutally china ppl hate yoobao
i planing to take out the board, and build a battery case, store at least 6 battery,
look might be ugly, but i must be better then any power bank at the market

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x-treme
post May 24 2013, 12:25 AM


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QUOTE(foohoa @ May 24 2013, 12:07 AM)
ICR 18650 = lithium cobalt oxide (traditional) cylindrical cell
IMR 18650 = lithium manganese oxide cylindrical cell
IFR 18650 = lithium iron phosphate cylindrical cell

found this,
however..........
not really know what is this
*
about these you can refer to batteryuniversity for more information.
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foohoa
post May 24 2013, 12:28 AM


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try to take out the yoobao 6600mah
which looks triangle
they look quiet honest
it was 3 ultrafire 3800mah

this
user posted image

This post has been edited by foohoa: May 24 2013, 12:30 AM
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x-treme
post May 24 2013, 12:33 AM


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QUOTE(foohoa @ May 24 2013, 12:22 AM)
yes...
i buy the ori, but...
i search online, acutally china ppl hate yoobao
i planing to take out the board, and build a battery case, store at least 6 battery,
look might be ugly, but i must be better then any power bank at the market
*
haha, but yoobao is quite popular in Malaysia. When you mention powerbank, they will think about Yoobao only. Ask someone to recommend, also only yoobao. rclxub.gif

good luck in your modification. but something i can share here.
the changing of lithium ion battery (18650) in laptop battery, they need to measure the internal resistance and get the nearest value of internal resistance for those battery to be connected in parallel.
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x-treme
post May 24 2013, 12:35 AM


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QUOTE(foohoa @ May 24 2013, 12:28 AM)
try to take out the yoobao 6600mah
which looks triangle
they look quiet honest
it was 3 ultrafire 3800mah

this
user posted image
*
really? ori using ultrafire battery?
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foohoa
post May 24 2013, 12:38 AM


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wow, ur pn-910 that top 2!

http://top.zol.com.cn/compositor/688/pocketpower.html
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foohoa
post May 24 2013, 12:38 AM


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wow, ur pn-910 at top 2!

http://top.zol.com.cn/compositor/688/pocketpower.html

they actually like pisen tongue.gif
malaysia market have pisen?

This post has been edited by foohoa: May 24 2013, 12:38 AM
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foohoa
post May 24 2013, 12:42 AM


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QUOTE(x-treme @ May 24 2013, 12:35 AM)
really? ori using ultrafire battery?
*
but i dont think this ultrafire is ori la
i just use about 2 to 3 month, and it die...
full charge and leave it for few hour, and the indicator light go to 3/5
and full charge again, few hour 3/5 again......
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x-treme
post May 24 2013, 12:46 AM


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QUOTE(foohoa @ May 24 2013, 12:38 AM)
wow, ur pn-910 at top 2!

http://top.zol.com.cn/compositor/688/pocketpower.html

they actually like pisen  tongue.gif
malaysia market have pisen?
*
the ranking doesn't mean anything. it is just the popularity.
pisen is more expensive than pineng.
you may look around here i think most people want a cheap and good quality.
so if it is not cheap AND good quality, it is very hard to sell.
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x-treme
post May 24 2013, 12:46 AM


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QUOTE(foohoa @ May 24 2013, 12:42 AM)
but i dont think this ultrafire is ori la
i just use about 2 to 3 month, and it die...
full charge and leave it for few hour, and the indicator light go to 3/5
and full charge again, few hour 3/5 again......
*
may be there are some problem with the circuit ?
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foohoa
post May 24 2013, 12:48 AM


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QUOTE(x-treme @ May 24 2013, 12:46 AM)
may be there are some problem with the circuit ?
*
dont think so,
because i use it to charges something i will run out at about 20 min
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x-treme
post May 24 2013, 12:59 AM


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QUOTE(foohoa @ May 24 2013, 12:48 AM)
dont think so,
because i use it to charges something i will run out at about 20 min
*
ok. try replace the battery and see whether it works or not.
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post May 26 2013, 06:52 PM


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QUOTE(jie88 @ May 19 2013, 01:42 PM)
Means that doesnt necessarily means original yoobao is better power bank??
*
Yoobao is just a brand. It depends on the quality of the internal components.

QUOTE(mi-g @ May 24 2013, 12:01 AM)
off topic abit

so now i know where my e-cig 18650 battery come from.. haha

currently using this battery
user posted image
*
Where did you buy the 18650? I'm looking for a few to replace my netbook's cells. 2 are dead.

QUOTE(foohoa @ May 24 2013, 12:07 AM)
ICR 18650 = lithium cobalt oxide (traditional) cylindrical cell
IMR 18650 = lithium manganese oxide cylindrical cell
IFR 18650 = lithium iron phosphate cylindrical cell

found this,
however..........
not really know what is this
*
That;s the battery chemistry, which allows for different charging curves. I'm not too familiar either.

QUOTE(x-treme @ May 24 2013, 12:33 AM)
haha, but yoobao is quite popular in Malaysia. When you mention powerbank, they will think about Yoobao only. Ask someone to recommend, also only yoobao.  rclxub.gif

good luck in your modification. but something i can share here.
the changing of lithium ion battery (18650) in laptop battery, they need to measure the internal resistance and get the nearest value of internal resistance for those battery to be connected in parallel.
*
x-treme, this is a fantastic thread. Thank you for the testing and information. This internal resistance for parallel connection info is also useful, as I thought you merely replaced the battery of like or greater capacity.

Will pin this to Note 2 thread.
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mi-g
post May 26 2013, 06:56 PM


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QUOTE(joytest @ May 26 2013, 06:52 PM)
Where did you buy the 18650? I'm looking for a few to replace my netbook's cells. 2 are dead.
*
you can ask at Vapors Community FB page https://www.facebook.com/groups/myvaporscomm/

normal price for one 18650 battery is around RM22-30. dont buy if the seller put price more than RM32. find the ones who sell around RM22-30 only.

This post has been edited by mi-g: May 26 2013, 06:58 PM
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x-treme
post May 26 2013, 07:09 PM


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QUOTE(mi-g @ May 26 2013, 06:56 PM)
you can ask at Vapors Community FB page https://www.facebook.com/groups/myvaporscomm/

normal price for one 18650 battery is around RM22-30. dont buy if the seller put price more than RM32. find the ones who sell around RM22-30 only.
*
there are 2 types 18650, 1 is with protection circuit and the other 1 is without protection circuit. so make sure you buy the correct 1 to use. smile.gif
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jie88
post May 27 2013, 09:29 AM


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QUOTE(x-treme @ May 26 2013, 07:09 PM)
there are 2 types 18650, 1 is with protection circuit and the other 1 is without protection circuit. so make sure you buy the correct 1 to use.  smile.gif
*
and whats the different with or without one bro ?
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foohoa
post May 27 2013, 10:37 AM


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the protection curcuit mean it limit the current, if no protection, the battery just give as much as current it can supply, so if something short, it was very dangerous
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esto
post May 27 2013, 04:35 PM


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Interesting thread!! smile.gif battery tech

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Nightstalker1993
post May 28 2013, 04:54 AM


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QUOTE(x-treme @ Apr 30 2013, 09:49 AM)
yup. for the 18650 size of battery, the highest capacity is 3100mAh, but it is expensive than 2600 and 2800 type. for those cheap powerbank they wont use that 3100mAh. only use around 2000-2400 like that or even lower capacity, so it can save cost. but if it using Li-Po type, it wont be so cheap also.

there exist 20k or 30k capacity, but it is big and expensive, rm300-500 or more. this type can be used for charging laptop.
*
Actually, AW and Eagletac are producing protected 18650 with capacities of 3400mAh, unprotected ones IIRC goes up to 3600mAh if i'm not mistaken.

by the way, where is your location, would be interested in passing you my power bank for testing or either could you lend me your resistors and the USB connector for testing?

I have the Yoobao YB-655 rated at 15600mAh and also an EXC with li-po batteries rated at 12000mAh. Would be interesting to test these 2 power banks as they are relatively new in the market as well.

QUOTE(foohoa @ May 24 2013, 12:28 AM)
try to take out the yoobao 6600mah
which looks triangle
they look quiet honest
it was 3 ultrafire 3800mah

this
user posted image
*
Ultrafire products are crap FYI. I've been playing with flashlights and Ultrafire are crap in the flashlight industry. Their batteries are also way overrated in terms of capacity. That 3800mAh capacity is definitely fake. And its highly unlikely they will use Ultrafire batteries in a power bank as it's most likely a protected cell as well. Nobody uses a protected cell in a multi-cell device with it's own circuitry.

QUOTE(foohoa @ May 27 2013, 10:37 AM)
the protection curcuit mean it limit the current, if no protection, the battery just give as much as current it can supply, so if something short, it was very dangerous
*
protection circuit also protects from overcharging(above 4.3v straight cutoff) and also overdischarging(cutoff below 2.7v). If protected cells are used in a high drain device(like in an e-cigg), the voltage may drop to below 2.7v due to the high current draw and activate the protection circuit which is why you don't see people using protected cells in high drain devices like e-ciggs and high-powered incandescent flashlights.
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x-treme
post May 29 2013, 08:44 AM


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QUOTE(Nightstalker1993 @ May 28 2013, 04:54 AM)
Actually, AW and Eagletac are producing protected 18650 with capacities of 3400mAh, unprotected ones IIRC goes up to 3600mAh if i'm not mistaken.

by the way, where is your location, would be interested in passing you my power bank for testing or either could you lend me your resistors and the USB connector for testing?
so far i had saw about 3400mAh battery. but i don't think it will be used for powerbank battery. Quite expensive.
Erm, this few weeks will be busy for my fyp and final exam. can test but not now.

QUOTE(Nightstalker1993 @ May 28 2013, 04:54 AM)
protection circuit also protects from overcharging(above 4.3v straight cutoff) and also overdischarging(cutoff below 2.7v). If protected cells are used in a high drain device(like in an e-cigg), the voltage may drop to below 2.7v due to the high current draw and activate the protection circuit which is why you don't see people using protected cells in high drain devices like e-ciggs and high-powered incandescent flashlights.
*
ya that's right. but how can they detect whether it is on low battery? because lithium ion battery will spoiled if voltage drop less than a certain thresold.
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Nightstalker1993
post May 30 2013, 04:26 AM


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QUOTE(x-treme @ May 29 2013, 08:44 AM)
so far i had saw about 3400mAh battery. but i don't think it will be used for powerbank battery. Quite expensive.
Erm, this few weeks will be busy for my fyp and final exam. can test but not now.
ya that's right. but how can they detect whether it is on low battery? because lithium ion battery will spoiled if voltage drop less than a certain thresold.
*
They rather add more cells than to purchase the 3400mAh cells. For example the YB-655 rated at 15600mAh means each cell is 2600mAh, but if you use 5x3400mAh you can achieve a higher capacity plus a smaller power bank but it's just not economical for them I guess.

Or either could you pass me a few pieces of your resistor and maybe your DMM so I could test it myself and post the results here as well? Your DMM comes with logging features?

And if you're talking about people who use unprotected cells, for eciggs once the battery reach a certain voltage the flavour and smoke amount will be different so that's a sign that the capacity is running low. Similar for a flashlight, once the battery reaches a certain voltage the light output will lower down showing the battery's almost up. Usually when this happens the battery should still be above 3.0v but unless the user is completely ignorant then yes he can run the battery down way past 2.7v and maybe even down to zero. By then the battery had been permanently damaged and had to be disposed of. That's why users who handle unprotected li-ion cells should be educated on it's characteristics and charging/discharging methods.
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UnifiAgent
post May 30 2013, 08:22 AM


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If anyone of you are looking for high quality power bank, feel free to visit my thread. Satisfaction guaranteed. Check out the feedback about it.
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x-treme
post May 30 2013, 02:19 PM


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QUOTE(Nightstalker1993 @ May 30 2013, 04:26 AM)
They rather add more cells than to purchase the 3400mAh cells. For example the YB-655 rated at 15600mAh means each cell is 2600mAh, but if you use 5x3400mAh you can achieve a higher capacity plus a smaller power bank but it's just not economical for them I guess.

Or either could you pass me a few pieces of your resistor and maybe your DMM so I could test it myself and post the results here as well? Your DMM comes with logging features?

And if you're talking about people who use unprotected cells, for eciggs once the battery reach a certain voltage the flavour and smoke amount will be different so that's a sign that the capacity is running low. Similar for a flashlight, once the battery reaches a certain voltage the light output will lower down showing the battery's almost up. Usually when this happens the battery should still be above 3.0v but unless the user is completely ignorant then yes he can run the battery down way past 2.7v and maybe even down to zero. By then the battery had been permanently damaged and had to be disposed of. That's why users who handle unprotected li-ion cells should be educated on it's characteristics and charging/discharging methods.
*
can't also. my fyp still need use these tools.
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x-treme
post May 30 2013, 02:20 PM


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QUOTE(UnifiAgent @ May 30 2013, 08:22 AM)
If anyone of you are looking for high quality power bank, feel free to visit my thread. Satisfaction guaranteed. Check out the feedback about it.
*
don't have price ? how you determine it is high quality powerbank ?
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sonicbreeze
post May 30 2013, 08:30 PM


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hello,do u noe yoobao 13000mah..usually can charge s3 for how many times?

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nghj
post May 31 2013, 09:05 AM


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i opened up my fake yoobao 11200mah powerbank.
inside only got 4x2200mah 3.7v batteries. rclxub.gif


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x-treme
post May 31 2013, 09:08 AM


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QUOTE(nghj @ May 31 2013, 09:05 AM)
i opened up my fake yoobao 11200mah powerbank.
inside only got 4x2200mah 3.7v batteries.  rclxub.gif
*
how do you know it is 2200mAh?
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nghj
post May 31 2013, 09:21 AM


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QUOTE(x-treme @ May 31 2013, 09:08 AM)
how do you know it is 2200mAh?
*
user posted image
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x-treme
post May 31 2013, 10:24 AM


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QUOTE(nghj @ May 31 2013, 09:21 AM)
user posted image
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i see. may be the actual capacity will be lower than that. hmm.gif
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Nightstalker1993
post Jun 1 2013, 05:58 AM


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i also opened my original Yoobao before, found 4x 2500mAh cells instead sweat.gif

weird thing is it's confirmed an original.
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post Jun 1 2013, 06:06 PM


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QUOTE(x-treme @ May 31 2013, 10:24 AM)
i see. may be the actual capacity will be lower than that.  hmm.gif
*
ya, maybe its low quality cell. i dont 'feel' that it lasts as long as it should.
8800mah@3.7v should be around 6512@5v. after 87% eff, its around 5665.
should be able to fully charge my phone (2100mah) around 2.7 times.
i only use to charge phone at night with airplane mode on, i can only use for 2 nights. after that, the powerbank is flat.

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x-treme
post Jun 1 2013, 08:28 PM


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QUOTE(Nightstalker1993 @ Jun 1 2013, 05:58 AM)
i also opened my original Yoobao before, found 4x 2500mAh cells instead sweat.gif

weird thing is it's confirmed an original.
*
swapped with fake unit?
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x-treme
post Jun 1 2013, 08:30 PM


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QUOTE(nghj @ Jun 1 2013, 06:06 PM)
ya, maybe its low quality cell. i dont 'feel' that it lasts as long as it should.
8800mah@3.7v should be around 6512@5v. after 87% eff, its around 5665.
should be able to fully charge my phone (2100mah) around 2.7 times.
i only use to charge phone at night with airplane mode on, i can only use for 2 nights. after that, the powerbank is flat.
*
may be you can try buy the 18650 cell on your own and replace it.
See whether there is improvement or not. icon_idea.gif
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Nightstalker1993
post Jun 2 2013, 03:38 AM


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QUOTE(x-treme @ Jun 1 2013, 08:28 PM)
swapped with fake unit?
*
nope it was an ori. confirmed original from the SN and also matches all 'original' markings found online
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post Jun 2 2013, 09:43 AM


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QUOTE(Nightstalker1993 @ Jun 2 2013, 03:38 AM)
nope it was an ori. confirmed original from the SN and also matches all 'original' markings found online
*
oh i see. may be the powerbank produced in different batch will use different type of cell. so only some powerbank have better quality. We can't see what cell used inside, so it just depend how lucky you are. thumbup.gif
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post Jun 2 2013, 10:50 AM


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How to prevent the powerbank from frying your phone motherboard?

Do we need to check the output capacity of the power bank?

I had bad experience with the Yoobao 11200 mAh powerbank. I have to send my Samsung Galaxy Note for replacement of motherboard after charging overnight with it and later when I had the same experience with Nokia Lumia 900.

The Yoobao was original cost I had send it for repair earlier at the serveice center in Jalan Segambut.

Any advice would be most appreciated.
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x-treme
post Jun 2 2013, 11:17 AM


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QUOTE(xyber9 @ Jun 2 2013, 10:50 AM)
How to prevent the powerbank from frying your phone motherboard?

Do we need to check the output capacity of the power bank?

I had bad experience with the Yoobao 11200 mAh powerbank.  I have to send my Samsung Galaxy Note for replacement of motherboard after charging overnight  with it and later when I had the same experience with Nokia Lumia 900.

The Yoobao was original cost I had send it for repair earlier at the serveice center in Jalan Segambut.

Any advice would be most appreciated.
*
are you sure with only charging with powerbank will fry your phone motherboard? how about normal ac charger?

there is a built in circuit to limit the current on phone motherboard. i had tried using 5V 3A charger to change my phone. when i measure, it only accept the current upto 1.1-1.2A and not 3A.

there are also built in circuit for powerbank itself, that's why it will have 2 output : 1A and 2.1A.
the rating is showing the max current that it allow, not must be exactly 1A.

so far i tried my times for overnight charging no problem on my phone. i like the feature that it will auto cut off when my phone is fully charged.

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Prince H
post Jun 2 2013, 12:56 PM


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QUOTE(x-treme @ Jun 2 2013, 12:17 PM)
are you sure with only charging with powerbank will fry your phone motherboard? how about normal ac charger?

there is a built in circuit to limit the current on phone motherboard. i had tried using 5V 3A charger to change my phone. when i measure, it only accept the current upto 1.1-1.2A and not 3A.

there are also built in circuit for powerbank itself, that's why it will have 2 output : 1A and 2.1A.
the rating is showing the max current that it allow, not must be exactly 1A.

so far i tried my times for overnight charging no problem on my phone. i like the feature that it will auto cut off when my phone is fully charged.
*
do yoobao have auto cut off feature?
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post Jun 2 2013, 01:06 PM


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Based on my estimation, PN-912 16800mAh will have 6 drycell?
1 cell=2800mAh
Am I right?
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x-treme
post Jun 2 2013, 01:14 PM


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QUOTE(Prince H @ Jun 2 2013, 12:56 PM)
do yoobao have auto cut off feature?
*
sorry i don't know about that. you may ask the yoobao seller or users.
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x-treme
post Jun 2 2013, 01:14 PM


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QUOTE(coklatua @ Jun 2 2013, 01:06 PM)
Based on my estimation, PN-912 16800mAh will have 6 drycell?
1 cell=2800mAh
Am I right?
*
yes, you are right. rclxms.gif
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post Jun 2 2013, 01:15 PM


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QUOTE(x-treme @ Jun 2 2013, 11:17 AM)
are you sure with only charging with powerbank will fry your phone motherboard? how about normal ac charger?

there is a built in circuit to limit the current on phone motherboard. i had tried using 5V 3A charger to change my phone. when i measure, it only accept the current upto 1.1-1.2A and not 3A.

there are also built in circuit for powerbank itself, that's why it will have 2 output : 1A and 2.1A.
the rating is showing the max current that it allow, not must be exactly 1A.

so far i tried my times for overnight charging no problem on my phone. i like the feature that it will auto cut off when my phone is fully charged.
*
There is no problem with normal AC charger. So I can use any type of power bank irrespective of the higher output rating of the mA compare to the smartphone input charging capacity.

Maybe I have a faulty Yoobao powerbank? How do I test using multimeter?

I do not dare to use another phone to charge again after it fried both my Samsung Galaxy Note and Nokia Lumia 900, fortunately both of them still under warranty. After charging both my phone went dead. Cannot on it back using what ever method.

So how do we test the power bank device that it is working properly?

How do we determine if the device has auto cut off when the batter charging is fully completed?
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post Jun 2 2013, 05:09 PM


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Just wanna share what I find.
Maybe to those who WTB new cells can refer to this thread.
https://forum.lowyat.net/topic/341954
user posted image
It seems that they use samsung cell.
But I dont know if they sell the cell only.

*also found this Sanyo cell which is 3400mAh. smile.gif
user posted image
http://www.lelong.com.my/evic-sany....

This post has been edited by coklatua: Jun 2 2013, 05:20 PM
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thesun
post Jun 2 2013, 05:47 PM


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the pineng 910 normally sell how much?
how many hours dicharge at 1A?
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nghj
post Jun 3 2013, 07:02 AM


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QUOTE(x-treme @ Jun 1 2013, 08:30 PM)
may be you can try buy the 18650 cell on your own and replace it.
See whether there is improvement or not. icon_idea.gif
*
i wonder whats the max capacity that the circuit board can handle.
maybe can add few more cells in paralel to increase the capacity.
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post Jun 3 2013, 11:22 AM


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QUOTE(xyber9 @ Jun 2 2013, 01:15 PM)
There is no problem with normal AC charger.  So I can use any type of power bank irrespective of the higher output rating of the mA compare to the smartphone input charging capacity.

Maybe I have a faulty Yoobao powerbank?  How do I test using multimeter?

I do not dare to use another phone to charge again after it fried both my Samsung Galaxy Note and Nokia Lumia 900, fortunately both of them still under warranty.  After charging both my phone went dead.  Cannot on it back using what ever method.

So how do we test the power bank device that it is working properly?

How do we determine if the device has auto cut off when the batter charging is fully completed?
*
about this i will reply when i free, now still busying for final year project. rclxub.gif
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post Jun 3 2013, 11:23 AM


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QUOTE(coklatua @ Jun 2 2013, 05:09 PM)
Just wanna share what I find.
Maybe to those who WTB new cells can refer to this thread.
https://forum.lowyat.net/topic/341954
user posted image
It seems that they use samsung cell.
But I dont know if they sell the cell only.

*also found this Sanyo cell which is 3400mAh. smile.gif
user posted image
http://www.lelong.com.my/evic-sany....
*
but how are you going to connect these battery? if i not mistaken they use nickel plating right?
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x-treme
post Jun 3 2013, 11:25 AM


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QUOTE(thesun @ Jun 2 2013, 05:47 PM)
the pineng 910 normally sell how much?
how many hours dicharge at 1A?
*
i tested for my unit and the result shown in first page. around 7 hours continuous. rclxms.gif
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post Jun 3 2013, 11:25 AM


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QUOTE(nghj @ Jun 3 2013, 07:02 AM)
i wonder whats the max capacity that the circuit board can handle.
maybe can add few more cells in paralel to increase the capacity.
*
may be you can try on it and share here. rclxm9.gif
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post Jun 3 2013, 11:51 AM


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QUOTE(x-treme @ Jun 3 2013, 11:25 AM)
may be you can try on it and share here.  rclxm9.gif
*
i can connect a few wires here and there
but i'm not very pro in electrical/electronic stuff.
what's the worst that can happen?
fry the board and the usb charger?

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x-treme
post Jun 3 2013, 12:22 PM


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QUOTE(nghj @ Jun 3 2013, 11:51 AM)
i can connect a few wires here and there
but i'm not very pro in electrical/electronic stuff.
what's the worst that can happen?
fry the board and the usb charger?
*
worst case, it melts your plastic case, explosion may be?
remember don't connect in reverse polarity, that is the most important.
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post Jun 3 2013, 01:18 PM


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QUOTE(x-treme @ Jun 3 2013, 11:23 AM)
but how are you going to connect these battery? if i not mistaken they use nickel plating right?
*
Yeah, need to find those soldering tabs.
Like this, http://www.batteryspace.com/Component-1-pc-Soldering-Tab-for-Li-Ion-/-LiMnNi-/-LFP-18650-battery.aspx
I wonder those electronic hardware shop have this.
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x-treme
post Jun 3 2013, 02:05 PM


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QUOTE(coklatua @ Jun 3 2013, 01:18 PM)
Yeah, need to find those soldering tabs.
Like this, http://www.batteryspace.com/Component-1-pc-Soldering-Tab-for-Li-Ion-/-LiMnNi-/-LFP-18650-battery.aspx
I wonder those electronic hardware shop have this.
*
but you will need spot weld too.
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post Jun 3 2013, 02:19 PM


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QUOTE(x-treme @ Jun 3 2013, 02:05 PM)
but you will need spot weld too.
*
I think I'll just solder it.
Like in this video,

smile.gif
Maybe I will try refilling my dead laptop battery my self.
I think I just need the 18650 cells and the soldering tab to make this project happen. biggrin.gif
Need to wait until next month since on tight budget right now to buy cells. sweat.gif
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rhoyo
post Jun 3 2013, 03:01 PM



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wow usefull information from this thread . just now i got pineng powerbank smile.gif
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ah joixl
post Jun 3 2013, 07:12 PM


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battery li-po vs li-on...which one better?
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x-treme
post Jun 3 2013, 07:45 PM


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QUOTE(ah joixl @ Jun 3 2013, 07:12 PM)
battery li-po vs li-on...which one better?
*
what is li-on? full name ?
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ah joixl
post Jun 3 2013, 07:48 PM


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QUOTE(x-treme @ Jun 3 2013, 07:45 PM)
what is li-on? full name ?
*
li-on = lithium ion ( widely used on branded phone)
li-po = lithium polymer
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x-treme
post Jun 3 2013, 07:54 PM


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QUOTE(ah joixl @ Jun 3 2013, 07:48 PM)
li-on = lithium ion ( widely used on branded phone)
li-po = lithium polymer
*
oh. lithium-ion i know, li-on i don't know.
lithium-ion is more common name.

lithium polymer is actually more flexible and can shape in any size, can be made as thin as 1mm.
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ah joixl
post Jun 3 2013, 07:57 PM


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QUOTE(x-treme @ Jun 3 2013, 07:54 PM)
oh. lithium-ion i know, li-on i don't know.
lithium-ion is more common name.

lithium polymer is actually more flexible and can shape in any size, can be made as thin as 1mm.
*
in other word, li-po is more lighter and the battery can't last long in term of usage, am i rite?
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x-treme
post Jun 3 2013, 08:01 PM


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QUOTE(ah joixl @ Jun 3 2013, 07:57 PM)
in other word, li-po is more lighter and the battery can't last long in term of usage, am i rite?
*
li-po is lighter because it din't use cylindrical, it use flexible foil type case, and this causes it less durable.
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ah joixl
post Jun 3 2013, 08:07 PM


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QUOTE(x-treme @ Jun 3 2013, 08:01 PM)
li-po is lighter because it din't use cylindrical, it use flexible foil type case, and this causes it less durable.
*
thanks..i need to know this, becoz i have one cheap tablet in my house that using li-po battery...
and the battery died very fast after using it..at least 1 .5 hr after full charged.


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x-treme
post Jun 3 2013, 08:10 PM


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QUOTE(ah joixl @ Jun 3 2013, 08:07 PM)
thanks..i need to know this, becoz i have one cheap tablet in my house that using li-po battery...
and the battery died very fast after using it..at least 1 .5 hr after full charged.
*
cheap tablet definitely using cheap quality battery, you can see in those powerbank.
So you want to replace the battery by yourself ?
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ah joixl
post Jun 3 2013, 08:18 PM


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QUOTE(x-treme @ Jun 3 2013, 08:10 PM)
cheap tablet definitely using cheap quality battery, you can see in those powerbank.
So you want to replace the battery by yourself ?
*
do you know how much can i spend for better battery that can run for longer hour?
btw the tab is 7in..hmm..i will figure out later to replace the battery by myself or no.
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x-treme
post Jun 3 2013, 08:20 PM


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QUOTE(ah joixl @ Jun 3 2013, 08:18 PM)
do you know how much can i spend for better battery that can run for longer hour?
btw the tab is 7in..hmm..i will figure out later to replace the battery by myself or no.
*
i not sure about that, but how are you going to buy the right dimension of battery that fit into your tablet ?
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ah joixl
post Jun 3 2013, 08:25 PM


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QUOTE(x-treme @ Jun 3 2013, 08:20 PM)
i not sure about that, but how are you going to buy the right dimension of battery that fit into your tablet ?
*
yeah its not simple..maybe getting powerbank charger is the better option i guess.
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x-treme
post Jun 3 2013, 08:38 PM


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QUOTE(ah joixl @ Jun 3 2013, 08:25 PM)
yeah its not simple..maybe getting powerbank charger is the better option i guess.
*
ya. if it is 18650 or other standard size then it is easy to replace.
Powerbank is a better choice, but it is less convenient to bring.
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ooze
post Jun 6 2013, 02:46 AM


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Have you all seen this before?
It's a power bank tube that allows you to swap the 18650 batteries. Anyone bringing this into Malaysia?

What do you guys think?

http://www.youtube.com/watch?v=Ls0czBpzAlc...be_gdata_player
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nghj
post Jun 6 2013, 08:13 AM


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there are lots of sellers on lelong selling 18650 4000mah at around RM15each, i doubt those are any good. anyone got recommendation for reliable batteries?
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x-treme
post Jun 6 2013, 11:44 AM


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QUOTE(ooze @ Jun 6 2013, 02:46 AM)
Have you all seen this before?
It's a power bank tube that allows you to swap the 18650 batteries. Anyone bringing this into Malaysia?

What do you guys think?

http://www.youtube.com/watch?v=Ls0czBpzAlc...be_gdata_player
*
yea. i will try on my own first.
some allow mix with different battery, but some just parallel those battery and then conversion to 5V.
those with parallel type should use the same type of battery and with nearest internal resistance.
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x-treme
post Jun 6 2013, 11:47 AM


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QUOTE(nghj @ Jun 6 2013, 08:13 AM)
there are lots of sellers on lelong selling 18650 4000mah at around RM15each, i doubt those are any good. anyone got recommendation for reliable batteries?
*
those 4000mAh are over rated. the maximum capacity right now is 3400mAh manufactured by panasonic.
so those with unknown brand and claim their battery capacity more than 3000mAh, mostly are fake.

recommended brand for battery: panasonic, sanyo, or samsung.
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x-treme
post Jun 6 2013, 11:47 AM


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QUOTE(nghj @ Jun 6 2013, 08:13 AM)
there are lots of sellers on lelong selling 18650 4000mah at around RM15each, i doubt those are any good. anyone got recommendation for reliable batteries?
*
those 4000mAh are over rated. the maximum capacity right now is 3400mAh manufactured by panasonic.
so those with unknown brand and claim their battery capacity more than 3000mAh, mostly are fake.

recommended brand for battery: panasonic, sanyo, or samsung.
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nghj
post Jun 6 2013, 12:19 PM


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QUOTE(x-treme @ Jun 6 2013, 11:47 AM)
those 4000mAh are over rated. the maximum capacity right now is 3400mAh manufactured by panasonic.
so those with unknown brand and claim their battery capacity more than 3000mAh, mostly are fake.

recommended brand for battery: panasonic, sanyo, or samsung.
*
any reliable recommended shop/seller?
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x-treme
post Jun 6 2013, 12:53 PM


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QUOTE(nghj @ Jun 6 2013, 12:19 PM)
any reliable recommended shop/seller?
*
erm. since i haven't bought before from local shop, so i can't recommend any seller here.
may be other lyn members can help you about this.
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post Jun 6 2013, 10:25 PM


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The youtube one is just one piece of 18650 battery that can be swapped. Looks so simple.
If you try and it's good, please PM me ya. Interested to get.
Thanks!

QUOTE(x-treme @ Jun 6 2013, 11:44 AM)
yea. i will try on my own first.
some allow mix with different battery, but some just parallel those battery and then conversion to 5V.
those with parallel type should use the same type of battery and with nearest internal resistance.
*
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x-treme
post Jun 6 2013, 10:33 PM


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QUOTE(ooze @ Jun 6 2013, 10:25 PM)
The youtube one is just one piece of 18650 battery that can be swapped. Looks so simple.
If you try and it's good, please PM me ya. Interested to get.
Thanks!
*
using 1 piece battery, why not consider buying 1 more extra battery for phone ?
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post Jun 6 2013, 10:40 PM


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Because... using iPhone and iPad smile.gif

And I want something super portable. Small and light.. can just throw in the bag. Thinking of getting Powerocks Magicstick now. Looks good. American brand. Any thoughts?


QUOTE(x-treme @ Jun 6 2013, 10:33 PM)
using 1 piece battery, why not consider buying 1 more extra battery for phone ?
*
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x-treme
post Jun 6 2013, 10:55 PM


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QUOTE(ooze @ Jun 6 2013, 10:40 PM)
Because... using iPhone and iPad smile.gif

And I want something super portable. Small and light.. can just throw in the bag. Thinking of getting Powerocks Magicstick now. Looks good. American brand. Any thoughts?
*
good reason. haha
i think at least 2 cell enough for use. iphone still ok, but ipad has very high capacity.
American brand should be expensive right?
But i will try for 2 changeable cell powerbank first.
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joytest
post Jun 17 2013, 12:19 AM


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I have 2 Yoobaos. 1 is the 11200 and one is the 13000. I opened up the 13000 model and it looks legit. My friend bought it in China for me at RMB280 at an upmarket shopping center.

» Click to show Spoiler - click again to hide... «


I can charge my Note 2 about a little less than 2.5 times.

Looks like it is giving an effective rating of :

(3.7/5) x (13000) x (75%) = 7215mAh

Would this calculation be a good indication of real mAh rating?

This post has been edited by joytest: Jun 17 2013, 12:20 AM
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post Jun 17 2013, 08:14 AM


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x-treme, when u opened ur PN-910, u figured out that the 18650 battery is 2800mah based on calculation, did u visually confirm that its written 2800mah?

This post has been edited by nghj: Jun 17 2013, 08:14 AM
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post Jun 17 2013, 08:36 AM


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gud test
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x-treme
post Jun 17 2013, 11:59 AM


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QUOTE(joytest @ Jun 17 2013, 12:19 AM)
I have 2 Yoobaos. 1 is the 11200 and one is the 13000. I opened up the 13000 model and it looks legit. My friend bought it in China for me at RMB280 at an upmarket shopping center.

» Click to show Spoiler - click again to hide... «


I can charge my Note 2 about a little less than 2.5 times.

Looks like it is giving an effective rating of :

(3.7/5) x (13000) x (75%) = 7215mAh

Would this calculation be a good indication of real mAh rating?
*
calculation can't indicate the actual capacity.
(3.7/5) x (13000) x (75%) = 7215mAh

7215mAh/ 3100 = 2.3 times

75% efficiency i think is because of large current drawn which reduce the efficiency.

RMB280 is quite expensive compared to Pineng.

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x-treme
post Jun 17 2013, 12:03 PM


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QUOTE(nghj @ Jun 17 2013, 08:14 AM)
x-treme, when u opened ur PN-910, u figured out that the 18650 battery is 2800mah based on calculation, did u visually confirm that its written 2800mah?
*
yes very confirm. it is the same type as shown in above picture from joytest.
but it written 2800mAh for each cell.

it is impossible to label lower capacity because it can't produce the higher output as measured.

it is not possible to label the larger capacity because it is not look those over rated 30000mAh, where actual capacity is far less than half of it.
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post Jun 17 2013, 02:23 PM


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QUOTE(x-treme @ Jun 17 2013, 11:59 AM)
calculation can't indicate the actual capacity.
(3.7/5) x (13000) x (75%) = 7215mAh

7215mAh/ 3100 = 2.3 times

75% efficiency i think is because of large current drawn which reduce the efficiency.

RMB280 is quite expensive compared to Pineng.
*
yes agree that YB is expensive.
Eg the latest YB model 'thunderbolt' 15600mah is around 250-270.
while Pineng PN-912 16800mah is around 190-220.
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post Jun 17 2013, 02:24 PM


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QUOTE(x-treme @ Jun 17 2013, 12:03 PM)
yes very confirm. it is the same type as shown in above picture from joytest.
but it written 2800mAh for each cell.

it is impossible to label lower capacity because it can't produce the higher output as measured.

it is not possible to label the larger capacity because it is not look those over rated 30000mAh, where actual capacity is far less than half of it.
*
ok, thanks for the info.
just to confirm cos all picture in ur thread show the pineng 18650 cell still wrapped in heat sink and cant see the numbers.
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walkeith25
post Jun 17 2013, 04:16 PM


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so late rhave kang taouser posted image
user posted image
user posted image
user posted image
user posted image
user posted image
user posted image
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x-treme
post Jun 20 2013, 05:07 PM


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QUOTE(nghj @ Jun 17 2013, 02:24 PM)
ok, thanks for the info.
just to confirm cos all picture in ur thread show the pineng 18650 cell still wrapped in heat sink and cant see the numbers.
*
see to believe. rclxms.gif
user posted image
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joytest
post Jun 20 2013, 05:37 PM


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QUOTE(x-treme @ Jun 20 2013, 05:07 PM)
see to believe.  rclxms.gif
user posted image
*
Same CMICR F8 cells .... wonder if I can swap out my faulty notebook cells for these.
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x-treme
post Jun 20 2013, 05:45 PM


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QUOTE(joytest @ Jun 20 2013, 05:37 PM)
Same CMICR F8 cells .... wonder if I can swap out my faulty notebook cells for these.
*
should be no problem for that. i had bought sanyo 2800mAh cell and plan to replace the notebook cells.
but the measured result shows the capacity is much lower than expected. may be just like the seller says that it needs 4.35V charger to fully charge it. Now plan to buy the cell with 2600mAh with required 4.2V to fully charge it. nod.gif
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joytest
post Jun 20 2013, 05:46 PM


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QUOTE(x-treme @ Jun 20 2013, 05:45 PM)
should be no problem for that. i had bought sanyo 2800mAh cell and plan to replace the notebook cells.
but the measured result shows the capacity is much lower than expected. may be just like the seller says that it needs 4.35V charger to fully charge it. Now plan to buy the cell with 2600mAh with required 4.2V to fully charge it. nod.gif
*
Where or how are you getting the 4.2V charger? Do you mean you will separately charge the 2600/2800 cells with the 4.2V charger before swapping out the notebook cells?
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x-treme
post Jun 20 2013, 05:51 PM


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QUOTE(joytest @ Jun 20 2013, 05:46 PM)
Where or how are you getting the 4.2V charger? Do you mean you will separately charge the 2600/2800 cells with the 4.2V charger before swapping out the notebook cells?
*
i bought from the same seller. 1 type is powerbank with changeable 18650 cells and another one is universal charger for Li-ion and NiMH battery, when it fully charged it shows the time required and capacity of the cell.

No need separately charge. The housing of the notebook cells containing the charging circuit, just plug into notebook to charge it. I don't know whether it is necessary to erase the data in the EEPROM or not, it stores the information of the battery.
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post Jun 21 2013, 06:03 PM


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do u sell pineng powerbank? n may i know how many times that 11,200mAh pineng powerbank can charge note 2?
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x-treme
post Jun 21 2013, 08:17 PM


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QUOTE(ereez_188 @ Jun 21 2013, 06:03 PM)
do u sell pineng powerbank? n may i know how many times that 11,200mAh pineng powerbank can charge note 2?
*
i don't have note 2 to test so i just can give you the estimation of the number of charging with efficiency of 85%.

Note 2 capacity is 3100mAh so it is about 2.3 times.
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ChuanHong
post Jun 22 2013, 12:28 AM


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im using EDVAN i-5 powerbank.

as shown like this link. http://76.my/Malaysia/edvan-i-5-power-bank...-vktech17@2.jpg

3000mah.

This post has been edited by ChuanHong: Jun 22 2013, 12:29 AM
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joytest
post Jun 22 2013, 12:36 AM


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QUOTE(ChuanHong @ Jun 22 2013, 12:28 AM)
im using EDVAN i-5 powerbank.

as shown like this link. http://76.my/Malaysia/edvan-i-5-power-bank...-vktech17@2.jpg

3000mah.
*
Very skinny LiPo
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heavenly91
post Jun 22 2013, 12:40 AM


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This is a very good educational thread.
Good job to TS
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joytest
post Jun 22 2013, 12:41 AM


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QUOTE(heavenly91 @ Jun 22 2013, 12:40 AM)
This is a very good educational thread.
Good job to TS
*
I can't help but provide a little education:

ERROR:
If you find any racist of trolls,


CORRECTION:
If you find any racist trolls,
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heavenly91
post Jun 22 2013, 12:43 AM


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QUOTE(joytest @ Jun 22 2013, 12:41 AM)
I can't help but provide a little education:

ERROR:
If you find any racist of trolls,
CORRECTION:
If you find any racist trolls,
*
typo and didn't bother to check.

It shud be racist or trolls.

not of.
thx for the feedback though.
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joytest
post Jun 22 2013, 12:43 AM


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QUOTE(heavenly91 @ Jun 22 2013, 12:43 AM)
typo and didn't bother to check.

It shud be racist or trolls.

not of.
thx for the feedback though.
*
Then your plurals should match... racists or trolls...
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heavenly91
post Jun 22 2013, 12:46 AM


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QUOTE(joytest @ Jun 22 2013, 12:43 AM)
Then your plurals should match... racists or trolls...
*
done.
Btw dunnid derail thread lol.
user posted image
Used this Pineng Charger for almost a month.
So far so good.
Thumbs up for a good product from Pineng thumbup.gif
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joytest
post Jun 22 2013, 12:57 AM


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QUOTE(heavenly91 @ Jun 22 2013, 12:46 AM)
done.
Btw dunnid derail thread lol.
user posted image
Used this Pineng Charger for almost a month.
So far so good.
Thumbs up for a good product from Pineng  thumbup.gif
*
Of course. tongue.gif

So how much did you get it for? And where?
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heavenly91
post Jun 22 2013, 12:58 AM


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edit

This post has been edited by heavenly91: Jun 22 2013, 02:10 PM
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Bunny.Hitam
post Jun 24 2013, 08:46 AM


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good job mangg.
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InternetBanking
post Jun 24 2013, 04:03 PM


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Never buy anything from myimart - cheat people. You see their terms and conditions? You must do this and that, otherwise you lose........... Well how about when they fail to fulfill their terms and conditions - nothing - they can just tell you wait few days more........... This happened to me - their merchant - can't deliver the service. Myimart promises to refund within 14 working days - well it's already 14 working days afterbut NO REFUND revceived. Why 14 days - are we living in the 18th century??? One can transfer money in seconds now!!! Well, you and I know that they make money like this. They get their merchants to not deliver their services - they enjoy the float and make money from bank interest!!!!! So think twice of myimart - better buy from others like Groupon, streetdeal and so many others that DON'T CHEAT
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ericmaxman
post Jun 25 2013, 08:30 AM


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QUOTE(joytest @ Jun 20 2013, 05:46 PM)
Where or how are you getting the 4.2V charger? Do you mean you will separately charge the 2600/2800 cells with the 4.2V charger before swapping out the notebook cells?
*
I use my Lipo battery charger, hooked up to 2 magnets laugh.gif

I've got ~20 18650 cells, but use them mainly in my flashlights. tongue.gif
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post Jun 25 2013, 11:41 AM


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one of the best looking powerbank that I have seen out there. Sadly, 1720mAh. sweat.gif
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post Jun 25 2013, 11:54 AM


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QUOTE(s7ran9er @ Jun 25 2013, 11:41 AM)


one of the best looking powerbank that I have seen out there. Sadly, 1720mAh.  sweat.gif
*
Good looking =/= Functional

tongue.gif
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x-treme
post Jun 25 2013, 11:58 AM


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QUOTE(joytest @ Jun 25 2013, 11:54 AM)
Good looking =/= Functional

tongue.gif
*
i think those with 1 or 2 cells 18650 type is better. it has bigger capacity than this.
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wingwp
post Jun 25 2013, 12:13 PM


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Any idea how's KingMax's power bank? Normally is it only 85% delivered as promised cos this thing claimed to have 8,000 mAh but I doubt that. I prefer all kind of slim version power bank.

user posted image
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x-treme
post Jun 25 2013, 12:40 PM


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QUOTE(wingwp @ Jun 25 2013, 12:13 PM)
Any idea how's KingMax's power bank? Normally is it only 85% delivered as promised cos this thing claimed to have 8,000 mAh but I doubt that. I prefer all kind of slim version power bank.

user posted image
*
din't use it before so i can't give you answer. you can calculate by counting the number of charging.
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thesun
post Jun 25 2013, 05:32 PM


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Anker powerbank also slim type..
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stimix
post Jun 27 2013, 12:32 PM


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x-treme ,

Normally for a rated 12,000mAH powerbank, how many times can charge a iphone 5 from 20% discharge point?

I got a Pineng 913 look-alike from MV PC fair last mth from this supplier http://metakey.com.my/os_view_full.php?id=651 This powerbank only gave me 4 times full charge on my iphone 5 from 20% level cry.gif and from your calculation, it suppose to give me atleast 5 times?

I suspect just a rebranded Pineng 10,000 mAH but claimed 12,000mAH vmad.gif mad.gif

I open up the cover and the so called genuine Samsung 3000mAHX4 batteries that they claimed are without Samsung logo and even without any MaH rating cry.gif rclxub.gif

This post has been edited by stimix: Jun 27 2013, 02:13 PM
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thesun
post Jun 27 2013, 12:48 PM


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Expect each cell less than 3000mah..
even if they write. 3kmah..

maybe 2.5kmah only the highest...
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stimix
post Jun 27 2013, 02:37 PM


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Well, I'm expecting similar specs to Pineng 913 since the look is exactly the same except diff brand name. The supplier told me made in M'sia using genuine Samsung batteries.. the PC fair stall also displaying Samusng batteries kaw-kaw + free one 3000mAH battery (eh..more like 2600Mah)

This is the inner look of the powerbank taken moment ago:

user posted image

I hope TS, can open his Pineng 913 and compare with this so called..M'sian maded using genuine samsung batteries shakehead.gif rclxub.gif
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x-treme
post Jun 27 2013, 05:38 PM


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QUOTE(stimix @ Jun 27 2013, 12:32 PM)
x-treme ,

Normally for a rated 12,000mAH powerbank, how many times can charge a iphone 5 from 20% discharge point?

I got a Pineng 913 look-alike from MV PC fair last mth from this supplier http://metakey.com.my/os_view_full.php?id=651  This powerbank only gave me 4 times full charge on my iphone 5 from 20% level  cry.gif  and from your calculation, it suppose to give me atleast 5 times?

I suspect just a rebranded Pineng 10,000 mAH but claimed 12,000mAH  vmad.gif  mad.gif

I open up the cover and the so called genuine Samsung 3000mAHX4 batteries that they claimed are without Samsung logo and even without any MaH rating  cry.gif  rclxub.gif
*
if it is 12000mAh real capacity, 12000 can charge iphone 5 1440 about 5.2 times. (0 to 100%)
conversion rate take 85% as average. normally good converter is above 80%.

those other than pineng but look like pineng brand 1 are imitation. i know that because those supplier had emailed me and advertised their product.

If i wasn't wrong Samsung din't produce 3000mAh battery. 3100 and 3400 battery is manufactured by panasonic.



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x-treme
post Jun 27 2013, 05:42 PM


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QUOTE(stimix @ Jun 27 2013, 02:37 PM)
Well, I'm expecting similar specs to Pineng 913 since the look is exactly the same except diff brand name. The supplier told me made in M'sia using genuine Samsung batteries.. the PC fair stall also displaying Samusng batteries kaw-kaw + free one 3000mAH battery (eh..more like 2600Mah)

This is the inner look of the powerbank taken moment ago:

user posted image

I hope TS, can open his Pineng 913 and compare with this so called..M'sian maded using genuine samsung batteries  shakehead.gif  rclxub.gif
*
i hope i can open too. but all units are sold out.
i had opened 1 unit of pn912, the circuit is almost same like pn-910 unit.
the battery colour is different a bit.


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stimix
post Jun 27 2013, 08:26 PM


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QUOTE(x-treme @ Jun 27 2013, 05:42 PM)
i hope i can open too. but all units are sold out.
i had opened 1 unit of pn912, the circuit is almost same like pn-910 unit.
the battery colour is different a bit.
*
If you have a chance in future do open up that PN913 & compare smile.gif

BTW, I suspect it's similar capacity to PN913 i.e 10,000mAH only and thus, can only charge max 4 X hmm.gif unless you tell me genuine 913 can charge more than 4?
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joytest
post Jun 29 2013, 01:38 AM


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x-treme you are probably an EE guy.

Want to ask, what's a good digital multimeter that I can get? I have been using a cheapo China one for my occasional hacking but would like to get something better.

I see you are using 2 Victor meters. What are the differences between the 2?

Also, do you have experience with those cheap oscilloscopes that are a sort of modded Android tablet?
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post Jun 29 2013, 02:00 AM


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QUOTE(x-treme @ Apr 29 2013, 07:31 PM)
PART 3: Lithium-ion / polymer (not 18650 battery,18650 is similar to AA type of cylindrical battery)

Borrowed another powerbank from my friend, it say it is using Li-Po ,smaller and thinner size.(diameter of 18650 battery is 18mm,this one is less than 18mm thickness)
The rated capacity is 5000mAh,everyone can guess how much is the real capacity?
user posted image

Battery inside is thin, but is it soft one, if you press it, it will not restore back to the original position.
user posted image

The voltage regulation is not good as PINENG powerbank, it fluctuate much more.
Some of the data taken:
4.77V 0.92A
4.80V 0.93A
4.64V 0.89A
4.48V 0.86A
4.37V 0.84A

From my calculation, the real capacity is only1.82W
Rated capacity 3.7Vx5000=18.5W only9.84% is the real one.
this powerbank had been used for 1 year plus, now only remain 9.84%,1.82W even can't charge iphone for half time.

For your information
Even though there aren't sand inside the powerbank, it doesn't mean it has real capacity.
For example: I opened a powerbank, inside contain 4 pcs of 18650 battery, if I said each 18650 battery has capacity of 10000mAh, 4x10000= 40000mAh. This can charge note 2 more than 10 times. Will you believe it?  rclxm9.gif  Don't laugh, there are people will believe this.
Remember the highest capacity of 18650 battery is 3100mAh,manufactured by Panasonic. Those who said it has 5000 or 10000mAh are cheating.[/size][/backcolor]
If the powerbank is not using 18650 battery, but is Li-Po type, the price is much higher than 18650 type. Li-Po is extra thin and slim. Manufacture price also higher. Those who sell at cheap price, you know la  nod.gif

Another sharing
Anyone can guess what is this ?
user posted image
It is battery but not AA type,is 18650 battery,it is used in our laptop battery, this is called 6-cell type.
This battery I disassembly from Lenovo laptop, rated capacity is 48Wh, each 18650 battery contain 8Wh, or 2162 mAh.

Everyone can see that even laptop also use 18650 battery, don't think that this type of battery not good, it is cheaper than Li-Po type.
*
Errr careful with that lipo battery, seems like ballooned up already. Not really sure(maybe the design is like that) but typically softness means the battery has problems and has released some gas(the softness might be due to a safety mechanism to prevent poisonous gas leaking).

Btw what you gonna do with thoose laptop battery? upgrade your powerbank?? brows.gif brows.gif
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coolkid_85
post Jul 2 2013, 01:26 PM


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all i can say is...WOW... haha..nice job done bro
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sniper on the roof
post Jul 2 2013, 01:47 PM


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x-treme Good job.. keep it up!!

Long time never see post as informative as this. smile.gif
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joytest
post Jul 2 2013, 01:55 PM


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QUOTE(sniper on the roof @ Jul 2 2013, 01:47 PM)
x-treme Good job.. keep it up!!

Long time never see post as informative as this. smile.gif
*
Maybe coz Malaysians do not have a habit of opening up stuff to see what's inside, and a general modder curiosity, except maybe for noisy motorbike exhausts.
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tcheepin
post Jul 2 2013, 02:31 PM


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great post been looking for this information for quite some time.
been curious the price difference on branded is because of branding or quality.
thanks for solving the myth.
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ilovelyn
post Jul 2 2013, 09:57 PM


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great post..

im using the same power bank

before this using no brand one, very low quality and capacity surely not as advertised
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thesun
post Jul 3 2013, 01:49 AM


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To prevent overcharging the powerbank, eventho it is equipped with auto cut off system,

i always record the time it plugs in to my phone,
and usually it take the same amount of time to gets recharged..

mine is windows phone 8, so i pin a special tiles that count down 1 hour and half.. After the time ends, it will alarm me.

even tho my phone still does not get fully charge, (cos im using wifi browse utube watever) it indicates that i have been using the powerbank for 1 hr and 30 min.. If i want to continue using it, i can set again the countdown or using stopwatch.

so the total hours will be added up, and i will know how long to charged the powerbank fully..that way, i wont hook up the powerbank to charger mkre than it needs..
usually ngam ngam it will stop blinking when i check.

actually have been planning to get small stopwatch and stick it to the powerbank, but not yet find.. Haha..
already got apps..

This post has been edited by thesun: Jul 3 2013, 01:59 AM
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x-treme
post Jul 13 2013, 11:08 AM


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there are a total of 6 cells in pn-912. rclxms.gif

user posted image
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joytest
post Jul 13 2013, 11:35 AM


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QUOTE(x-treme @ Jul 13 2013, 11:08 AM)
there are a total of 6 cells in pn-912. rclxms.gif

user posted image
*
Would you be able to assess the charging board? What kind of regulator are they using?
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thesun
post Jul 14 2013, 06:19 PM


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QUOTE(x-treme @ Jul 13 2013, 11:08 AM)
there are a total of 6 cells in pn-912. rclxms.gif

user posted image
*
u open customer punya powerbank ah?

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x-treme
post Jul 14 2013, 11:18 PM


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QUOTE(thesun @ Jul 14 2013, 06:19 PM)
u open customer punya powerbank ah?
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haha. that one is customer returned set, opened for repairing.
so this set i kept for myself. biggrin.gif
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joytest
post Jul 14 2013, 11:51 PM


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QUOTE(x-treme @ Jul 14 2013, 11:18 PM)
haha. that one is customer returned set, opened for repairing.
so this set i kept for myself. biggrin.gif
*
What kind of repair is performed on a returned powerbank?
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post Jul 15 2013, 10:04 AM


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Fuiyo~~, current got 50000 mAh powerbank d
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x-treme
post Jul 15 2013, 10:28 AM


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QUOTE(joytest @ Jul 14 2013, 11:51 PM)
What kind of repair is performed on a returned powerbank?
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reconnect for disconnected component. it works well but i plan to keep it for myself.
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x-treme
post Jul 15 2013, 10:30 AM


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QUOTE(x132755 @ Jul 15 2013, 10:04 AM)
Fuiyo~~, current got 50000 mAh powerbank d
*
yea. people like large number. they can produce 100k too if you want.
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joytest
post Jul 15 2013, 10:42 AM


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QUOTE(x-treme @ Jul 15 2013, 10:28 AM)
reconnect for disconnected component. it works well but i plan  to keep it for myself.
*
Bro wad is the digital multi meter u are using? Do u also recommend the butane based soldering irons?
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x132755
post Jul 15 2013, 11:00 AM


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QUOTE(x-treme @ Jul 15 2013, 10:30 AM)
yea. people like large number. they can produce 100k too if you want.
*
indeed, there is powerbank to charge car d..
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Mr.Docter
post Jul 15 2013, 03:06 PM


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Very brilliant thread! biggrin.gif

Any recommendation or even better if TS selling Powerbank?
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cubex
post Jul 16 2013, 12:06 PM


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thanks for the thread! good info!
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x-treme
post Jul 16 2013, 12:15 PM


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QUOTE(joytest @ Jul 15 2013, 10:42 AM)
Bro wad is the digital multi meter u are using? Do u also recommend the butane based soldering irons?
*
i just use normal multi meter. victor brand.
butane based mainly for portable purpose.
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x-treme
post Jul 16 2013, 12:16 PM


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QUOTE(x132755 @ Jul 15 2013, 11:00 AM)
indeed, there is powerbank to charge car d..
*
yea. it ia not cheap too.
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x-treme
post Jul 16 2013, 12:17 PM


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QUOTE(Mr.Docter @ Jul 15 2013, 03:06 PM)
Very brilliant thread! biggrin.gif

Any recommendation or even better if TS selling Powerbank?
*
just recommend buy the original product smile.gif
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aLpHa-Ev7
post Jul 20 2013, 05:59 AM


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QUOTE(Mr.Docter @ Jul 15 2013, 03:06 PM)
Very brilliant thread! biggrin.gif

Any recommendation or even better if TS selling Powerbank?
*
Great and informative thread TS.

Mr Docter, can get from Impulse Megastore. They are authorized reseller in M'sia and Singapore. 1 year 1 to 1 warranty and free shipping.

https://forum.lowyat.net/index.php?showtopic=2822424&hl=
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Mr.Docter
post Jul 20 2013, 06:21 AM


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QUOTE(aLpHa-Ev7 @ Jul 20 2013, 05:59 AM)
Great and informative thread TS.

Mr Docter, can get from Impulse Megastore. They are authorized reseller in M'sia and Singapore. 1 year 1 to 1 warranty and free shipping.

https://forum.lowyat.net/index.php?showtopic=2822424&hl=
*
Hey thanks!

The sales thread looks rock solid. Thanks for sharing it again! cheers.gif
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aLpHa-Ev7
post Jul 20 2013, 12:20 PM


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QUOTE(Mr.Docter @ Jul 20 2013, 06:21 AM)
Hey thanks!

The sales thread looks rock solid. Thanks for sharing it again! cheers.gif
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Sharing is caring rclxms.gif
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Naqiudin
post Jul 20 2013, 05:26 PM


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Hey guys i saw this power, no review online yet , what do you guys think about it?
Zerne power bank
Or should i just get the pineng 910? Plus i can make my custom sticker on that drool.gif

This post has been edited by Naqiudin: Jul 20 2013, 05:26 PM
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noien
post Jul 24 2013, 12:22 AM


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very detail explaination
thanx a lot
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xzation01z
post Jul 25 2013, 05:22 PM


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Ordered this from Taobao with some 18650 batteries rclxub.gif bought 3 powerbanks from those deal websites, 1 come out smoke, 2 dead vmad.gif
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joytest
post Jul 25 2013, 05:24 PM


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QUOTE(xzation01z @ Jul 25 2013, 05:22 PM)
Ordered this from Taobao with some 18650 batteries  rclxub.gif bought 3 powerbanks from those deal websites, 1 come out smoke, 2 dead  vmad.gif
*
Item link?
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xzation01z
post Jul 25 2013, 05:27 PM


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QUOTE(joytest @ Jul 25 2013, 05:24 PM)
Item link?
*
http://itbbs.pconline.com.cn/market/15460034.html

by the way dont buy from streetdeal, powerbank came out smoke, ask for warranty, no replies for emails and also not picking up phone vmad.gif vmad.gif
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x-treme
post Jul 25 2013, 05:47 PM


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QUOTE(xzation01z @ Jul 25 2013, 05:27 PM)
http://itbbs.pconline.com.cn/market/15460034.html

by the way dont buy from streetdeal, powerbank came out smoke, ask for warranty, no replies for emails and also not picking up phone  vmad.gif  vmad.gif
*
maybe it is not original ?
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xzation01z
post Jul 25 2013, 06:01 PM


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QUOTE(x-treme @ Jul 25 2013, 05:47 PM)
maybe it is not original ?
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it is the common design where you can see everywhere lol
user posted image
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x-treme
post Jul 25 2013, 06:07 PM


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QUOTE(xzation01z @ Jul 25 2013, 06:01 PM)
it is the common design where you can see everywhere lol
user posted image
*
i thought it is the one as shown in the link
user posted image

those type 10k, 20k or 30k there are different quality too.
i found the realplay 30k has capacity greater than pn910
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nghj
post Jul 26 2013, 07:23 AM


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QUOTE(x-treme @ Jul 25 2013, 06:07 PM)
i thought it is the one as shown in the link
user posted image

those type 10k, 20k or 30k there are different quality too.
i found the realplay 30k has capacity greater than pn910
*
here's another battery box. comes with 6 x 18650 @3400 mah each.
able to output at 3.7v, 5v, 9v ,12v

http://www.fasttech.com/products/0/1000446...l-usb-output-mo

This post has been edited by nghj: Jul 26 2013, 07:25 AM
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kuai_chai
post Jul 26 2013, 06:51 PM


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just for some info, is there any powerbank that inputs mini usb ports rather than micro usb ports?
i've ordered a powerbank but i'm not sure it's mini usb or micro usb.
i want to buy a spare cable for it as my previous cables already spoilt.
now i'm thinking to buy a mini usb or micro usb cable..
any idea?

this is the 1 i bought: http://www.milkadeal.com/deals/blossomswan...hlightpowerbank

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joytest
post Jul 26 2013, 06:56 PM


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QUOTE(kuai_chai @ Jul 26 2013, 06:51 PM)
just for some info, is there any powerbank that inputs mini usb ports rather than micro usb ports?
i've ordered a powerbank but i'm not sure it's mini usb or micro usb.
i want to buy a spare cable for it as my previous cables already spoilt.
now i'm thinking to buy a mini usb or micro usb cable..
any idea?

this is the 1 i bought: http://www.milkadeal.com/deals/blossomswan...hlightpowerbank
*
The image looks like micro usb. But I'm skeptical of the claimed 30k rating.
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nghj
post Jul 27 2013, 02:03 PM


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QUOTE(kuai_chai @ Jul 26 2013, 06:51 PM)
just for some info, is there any powerbank that inputs mini usb ports rather than micro usb ports?
i've ordered a powerbank but i'm not sure it's mini usb or micro usb.
i want to buy a spare cable for it as my previous cables already spoilt.
now i'm thinking to buy a mini usb or micro usb cable..
any idea?

this is the 1 i bought: http://www.milkadeal.com/deals/blossomswan...hlightpowerbank
*
ur power bank is fake clone of this one
http://pineng.com.my/PN-913/PINENG-PN-913-...ower-Bank-Black

the input is micro usb, capacity around 10000mah.
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Notoriez
post Jul 27 2013, 02:42 PM


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QUOTE(nghj @ May 31 2013, 09:21 AM)
user posted image
*
This battery comes free with most china replica vape mods.

RM10 la people sell normally for this battery
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joytest
post Jul 27 2013, 03:24 PM


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QUOTE(Notoriez @ Jul 27 2013, 02:42 PM)
This battery comes free with most china replica vape mods.

RM10 la people sell normally for this battery
*
RM10 may be the china no-name no protection type.
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chrisqck
post Aug 3 2013, 12:40 PM


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Hi All,

WTA some clarification with regards to 1st post... So if I have a 2800 mAh and the handphone battery is 1700 mAh, how do I calculate what the the true charge capacity ?

Appreciate if could explain also the reason behind the calculation. I would like to learn more about powerbanks : ) Thanks in advance.
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thesun
post Aug 3 2013, 12:50 PM


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QUOTE(chrisqck @ Aug 3 2013, 12:40 PM)
Hi All,

WTA some clarification with regards to 1st post...  So if I have a 2800 mAh and the handphone battery is 1700 mAh, how do I calculate what the the true charge capacity ? 

Appreciate if could explain also the reason behind the calculation. I would like to learn more about powerbanks : )  Thanks in advance.
*
2800mah x 3.7V / 5V = 2072mah..
should be able to charge ur phone at least one times with phone off..
if on wifi, play video etc while charging, wont fully charge of course.

powerbank mah times nominal powebank battery output, 3.7V, divide by its output voltage which is 5V..

simply said, the 2800mah is at 3.7V,
if change voltage to 5V, mah will drop..
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chrisqck
post Aug 4 2013, 08:39 PM


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QUOTE(thesun @ Aug 3 2013, 12:50 PM)
2800mah x 3.7V / 5V = 2072mah..
should be able to charge ur phone at least one times with phone off..
if on wifi, play video etc while charging, wont fully charge of course.

powerbank mah times nominal powebank battery output, 3.7V, divide by its output voltage which is 5V..

simply said, the 2800mah is at 3.7V,
if change voltage to 5V, mah will drop..
*
Thanks for the reply.

Assuming that the powerbank is made of multiple cylindrical batteries output at 3.7V, the powerbank consolidates the output of each battery into one main output, the USB interface, which discharge at 5V. Hence the formula used above, correct ?

I have a YooBao YB-645 which claims to have the capacity of 8800mAh. The Input was stated as 5V/1500mA and the output was stated as 5V/1000mA.

So based on what I understand so far,

a) 8800mAh * 3.7V = 32,560 then 32,560 / 5V = 6,512 mAh is the ACTUAL capacity (assuming 100%).




Further Questions :

1) Is 100% output capacity a reasonable expectation for NEW powerbanks or is it by nature not possible ? (Kinda like buying a 1TB HDD is not possible to get *exactly* 1TB space inside)

2) Input basically just tells you at what rate it is charging the power bank, rite? It doesn't in any way change the total capacity of the powerbank since the capacity is already fixed, right ?



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thesun
post Aug 4 2013, 09:51 PM


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QUOTE(chrisqck @ Aug 4 2013, 08:39 PM)
Thanks for the reply.

Assuming that the powerbank is made of multiple cylindrical batteries output at 3.7V, the powerbank consolidates the output of each battery into one main output, the USB interface, which discharge at 5V. Hence the formula used above, correct ?

I have a YooBao YB-645 which claims to have the capacity of 8800mAh. The Input was stated as 5V/1500mA and the output was stated as 5V/1000mA.

So based on what I understand so far,

a) 8800mAh * 3.7V = 32,560 then 32,560 / 5V = 6,512 mAh is the ACTUAL capacity (assuming 100%).
Further Questions :

1) Is 100% output capacity a reasonable expectation for NEW powerbanks or is it by nature not possible ?  (Kinda like buying a 1TB HDD is not possible to get *exactly* 1TB space inside)

2) Input basically just tells you at what rate it is charging the power bank, rite? It doesn't in any way change the total capacity of the powerbank since the capacity is already fixed, right ?
*
1. Correct, but not too far lah.. If 16800mah, charge iphone one time only, obviously tipu punya.
2. Yes.
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nghj
post Aug 5 2013, 09:46 AM


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QUOTE(chrisqck @ Aug 4 2013, 08:39 PM)
Thanks for the reply.

Assuming that the powerbank is made of multiple cylindrical batteries output at 3.7V, the powerbank consolidates the output of each battery into one main output, the USB interface, which discharge at 5V. Hence the formula used above, correct ?

I have a YooBao YB-645 which claims to have the capacity of 8800mAh. The Input was stated as 5V/1500mA and the output was stated as 5V/1000mA.

So based on what I understand so far,

a) 8800mAh * 3.7V = 32,560 then 32,560 / 5V = 6,512 mAh is the ACTUAL capacity (assuming 100%).
Further Questions :

1) Is 100% output capacity a reasonable expectation for NEW powerbanks or is it by nature not possible ?  (Kinda like buying a 1TB HDD is not possible to get *exactly* 1TB space inside)

2) Input basically just tells you at what rate it is charging the power bank, rite? It doesn't in any way change the total capacity of the powerbank since the capacity is already fixed, right ?
*
you can refer to first page for some sample calculations.
you wont get 100% output, there will be some loss in the circuit (as seen in power bank gets hot), so you can expect around 90% efficiency or so.
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x-treme
post Aug 5 2013, 07:14 PM


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QUOTE(chrisqck @ Aug 4 2013, 08:39 PM)
Thanks for the reply.

Assuming that the powerbank is made of multiple cylindrical batteries output at 3.7V, the powerbank consolidates the output of each battery into one main output, the USB interface, which discharge at 5V. Hence the formula used above, correct ?

I have a YooBao YB-645 which claims to have the capacity of 8800mAh. The Input was stated as 5V/1500mA and the output was stated as 5V/1000mA.

So based on what I understand so far,

a) 8800mAh * 3.7V = 32,560 then 32,560 / 5V = 6,512 mAh is the ACTUAL capacity (assuming 100%).
Further Questions :

1) Is 100% output capacity a reasonable expectation for NEW powerbanks or is it by nature not possible ?  (Kinda like buying a 1TB HDD is not possible to get *exactly* 1TB space inside)

2) Input basically just tells you at what rate it is charging the power bank, rite? It doesn't in any way change the total capacity of the powerbank since the capacity is already fixed, right ?
*
i suggest that use power to rated the capacity will be better. (watt-hour)
no matter at what voltage, power will be the same. that's why tnb use this to count the electrical usage.

1) the capacity is almost 100%. for example, if you have a smartphone which is using 2500mAh battery, can last for 5 hours continuous usage, you have a powerbank which is 10000mAh. If you directly supply the phone with this 3.7/10000mAh without conversion, then you should get total of 4x5 hours = 20 hours.
Now if you use powerbank to charge the battery inside the phone, you will get less than 20 hours because of losses during conversion.

for HDD 1kb=/=1000byte, is 1024b or 2^10byte
that's why 1TB they count for 1x10^12byte and 1x10^12=/=1TB, but is around 0.9TB something.

2) yes it doesn't change the capacity.
so if you measure the input power (W) to charge the powerbank, it doesn't prove that powerbank can store that amount of charge. A high input power required but after charged it gives low output power, means that the conversion during charging has high losses.
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DeadlySkullz
post Aug 5 2013, 08:14 PM


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QUOTE(x-treme @ Apr 29 2013, 07:31 PM)
Part 2: So called 20000mAh powerbank test

i had borrowed 20000mAh powerbank from my friend. Due to warranty reason, my friend not allow me to open it.
tried some method to figure out how many 18650 battery inside the powerbank, lastly i use torch light and saw there are 6 18650 battery.
What is the capacity of each 18650 battery i'm not sure, but i can test and prove it.

user posted image

Written 20000mAh, made in Taiwan
Written 2 output current: 2.1A and 1.0A. After i tested, it is just a parallel output from same source, not separated.
user posted image
This set up is similar with my part 1 test, using 2 10ohm resistor in parallel, resulting 5ohm resistance.
Output current stable: 4.79V, 0.94A
user posted image

Result are recorded, total discharge time is 4 hour 40 minutes. Total output power is 21.01Wh, only 28.4% is the REAL output power.
Rated capacity is 3.7V X 20000mAh = 74Wh (vs 21.02Wh Real)

[My tested PN-910 had discharged for 7 hour and 20 minutes, total output power is 34.13Wh, 82.4% is the REAL output power]
Rated capacity is 3.7 x 11200mAh = 41.44Wh (vs 34.13Wh Real)
user posted image

The 20000mAh powerbank had been tested for twice because the first time test i had over estimated it can discharge for at least 5 hours.
But it is actually less than 5 hours.

Dimension measurement by vernier calipers(20000mAh):135mm x 71mm x 24mm
(my friend said this unit was selling with price tag of RM110)
*
Do u know how to open this powerbank?

This post has been edited by DeadlySkullz: Aug 5 2013, 08:15 PM
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im_engineer
post Aug 6 2013, 06:18 PM


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do you heard before Silvertech this brand?
they said they are using the Sanyo cell..what do u think?
http://silvertec.com/products_detail.php?id=119

compare to to pn-910 and the silvertech 7800mah one..which one do u think it can charge an iphone 5 for more no. of cycle?
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lord14383
post Aug 11 2013, 01:29 PM


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Is anyone using this? I am afraid I get cheated, because this power bank cost me RM150.user posted image
I am using Edvan 8400mAh, but I am not sure whether this power bank is consider good or bad.

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joytest
post Aug 11 2013, 01:34 PM


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QUOTE(lord14383 @ Aug 11 2013, 01:29 PM)
Is anyone using this? I am afraid I get cheated, because this power bank cost me RM150.user posted image
I am using Edvan 8400mAh, but I am not sure whether this power bank is consider good or bad.
*
There are so many brands. Why don't you try and see how many times it can charge your phone. You take 8400 and consider 75% as real capacity. If it charges your phone sufficiently up to this rating you should be fine.
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lord14383
post Aug 11 2013, 02:24 PM


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QUOTE(joytest @ Aug 11 2013, 01:34 PM)
There are so many brands. Why don't you try and see how many times it can charge your phone. You take 8400 and consider 75% as real capacity.  If it charges your phone sufficiently up to this rating you should be fine.
*
I always charging my phone while I am playing game.
I may need to test it out one day thanks a lot for your reply.
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fkinmeng
post Aug 11 2013, 03:26 PM


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my yoobao yb-642 is slowly dying on me, am wondering if constant exposure to heat will damage it? i always keep it inside my car's dashboard. sleep.gif
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joytest
post Aug 11 2013, 03:53 PM


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QUOTE(fkinmeng @ Aug 11 2013, 03:26 PM)
my yoobao yb-642 is slowly dying on me, am wondering if constant exposure to heat will damage it? i always keep it inside my car's dashboard. sleep.gif
*
Heat is bad for batteries. Keeping it in the glove compartment will be a little better but how do you charge it?
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lord14383
post Aug 11 2013, 04:21 PM


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QUOTE(joytest @ Aug 11 2013, 01:34 PM)
There are so many brands. Why don't you try and see how many times it can charge your phone. You take 8400 and consider 75% as real capacity.  If it charges your phone sufficiently up to this rating you should be fine.
*
Do I need to use my handphone and power bank from fully charged until the battery totally plat? Because I am afraid it will destroy my handphone aand power bank battery if I do it this way.
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joytest
post Aug 11 2013, 04:32 PM


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QUOTE(lord14383 @ Aug 11 2013, 04:21 PM)
Do I need to use my handphone and power bank from fully charged until the battery totally plat? Because I am afraid it will destroy my handphone aand power bank battery if I do it this way.
*
Lithium batteries should be recharged from about 10% from what I've read all over.
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lord14383
post Aug 11 2013, 04:38 PM


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QUOTE(joytest @ Aug 11 2013, 04:32 PM)
Lithium batteries should be recharged froyo about 10% from what I've read all over.
*
which mean I should charge my handphone and powerbank when it reach 10%

Thank you so much by giving this information.
Thanks a lot.
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lord14383
post Aug 11 2013, 10:28 PM


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QUOTE(lord14383 @ Aug 11 2013, 02:24 PM)
I always charging my phone while I am playing game.
I may need to test it out one day thanks a lot for your reply.
*
May i know how you all test the power bank? (charge with or without shut down smartphone?)
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fkinmeng
post Aug 12 2013, 07:44 PM


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QUOTE(joytest @ Aug 11 2013, 03:53 PM)
Heat is bad for batteries. Keeping it in the glove compartment will be a little better but how do you charge it?
*
oops my bad, i meant glove compartment. blush.gif

1 year old and it's gone, certified original yoobao.
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post Aug 13 2013, 11:19 AM


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QUOTE(thesun @ Aug 3 2013, 12:50 PM)
2800mah x 3.7V / 5V = 2072mah..
should be able to charge ur phone at least one times with phone off..
if on wifi, play video etc while charging, wont fully charge of course.

powerbank mah times nominal powebank battery output, 3.7V, divide by its output voltage which is 5V..

simply said, the 2800mah is at 3.7V,
if change voltage to 5V, mah will drop..
*
yes usb is 5V but it's also charging a lower volatage 3.7V handphone battery.. so means MAh will increase back..
so just compare powerbank capacity with handphone battery since both is 3.7V type , of cos with some conversion losses..
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