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Need help regarding altering battery bank tp4221B

khankll

Feb 6, 2011
110
Joined
Feb 6, 2011
Messages
110
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
 

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ver chan

Jun 27, 2015
55
Joined
Jun 27, 2015
Messages
55
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.
 
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