Sharing is caring

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

This post has been edited by Naqiudin: Jul 20 2013, 05:26 PM

very detail explaination
thanx a lot

Ordered this from Taobao with some 18650 batteries bought 3 powerbanks from those deal websites, 1 come out smoke, 2 dead

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

maybe it is not original ?

it is the common design where you can see everywhere lol

i thought it is the one as shown in the link


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

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.

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.

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.

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..

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.

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.