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?


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


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?    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 

Another sharing
Anyone can guess what is this ?

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.