Resurrecting dead power banks from Russia.

Mikhail, generously sent some Russian treats and a couple of dead power banks for our entertainment. One of them is quite unusual in its use of a microcontroller.
The Sbiten is an interesting thick sugar/honey syrup flavoured with powdered spices.
It's nice that many of the Russian flavours are similar to those of European countries.
When attempting to explore or repair lithium power banks, keep in mind that if charged they can suddenly let rip if you short something out. Keep a metal bin or tray on hand to throw it into if things go wrong.
If a cell has discharged too low it may recover fully if gently charged up to its base 3V level. I wouldn't recommend using them for a high current application though. A faulty lithium cell will tend to discharge itself when not in use, and at that point it should be recycled.
If you enjoy these videos you can help support the channel with a dollar for coffee, cookies and random gadgets for disassembly at:-
This also keeps the channel independent of YouTube's advertising algorithms allowing it to be a bit more dangerous and naughty.