Need help regarding altering battery bank tp4221B

[khankll]

hi
i have bought a xiaomi battery bank 10400 mah but it is fake. one of its cell is filled with sand.
others are of poor quality hardly 300-500mah each.

i looked at circuit board. there is an ic from tpower tp4221B . this is smart ic for liion battery charging.

i checked the cells voltage when it fully charged them .cells were charged to 4.2 volts then it stopped . charging current was 500 mah . input charger and its cable is fully capable of 2 ampere current (and tested as well ). so it means its charging at this little rate.

now i have soem good liion batteries but they are to be charged at 4.35 volts not at 4.2..
i looked at the ic specs it supports 1.3 Amp of charging current , 1 amp discharge, and supports both 4.2 and 4.35 volts chemistry liions.

it has been a lot of time since i did electronics. please help me in finding achieve above two purposes.

pictures of the circuit are uploaded .

some refrence to the data sheet are given below.

http://www.zjwic.com/upload/day_141201/201412011810438939.pdf
http://shopper.life/diy-xiaomi-10400mah-powerbank-3041.html#comment13297

 

[ver chan]

hello, you said that your battery bank is fake, if you tried to restore this device by replacing other component, i think it will not perform a 100 percent accuracy and satisfying reliability, because some other parts may fail (as you have said before, the device is fake), my worried is- you may just waste time, effort and money, if you want to learn through application, make your own battery bank using original electronic component.

 

[Shanu das]

Can i use this on 12v battery?