Is it possible to "grow" the capacity of PowerBank?

Question

Batteries

There is a Chinese PowerBank, I want to increase its capacity by soldering more lithium cans plus those that are already inside, the question is whether any banks will do or is it necessary that everyone be the same, including those that are already inside?

Answer 1

DO NOT climb into the PowerBank filling, you
need to open it and see,
A little theory -
if there are ordinary acid cans, then you can not bathe, take cans of the same capacity and put as much as you want (they will just warm up when recharging, which is normal)
li-on batteries cannot be recharged , if the voltage is exceeded (more than 4.22), the bank may explode. a balancer is needed to charge several cans, and it is unlikely that it is designed to add more cans. if you stick the banks in parallel and bypassing the balancer it will work (until the first explosion)