USB LIR2032 button cell charger (Patreon)

2032 lithium cell charger with reverse polarity test

These USB powered chargers are only suitable for charging the LIR2032 rechargeable versions of the lithium button cells. Do not put a non rechargeable cell into them. The charge current is about 15mA, which is well within the sensible range for these cells. The strange bypass resistor is odd, so I'd suggest not leaving cells in the charger continuously, although the leakage is small at around 6uA. The chip seems to have various protective functions for the inevitable time that a cell gets put in backwards. There is no facility for indicating to "intelligent" USB chargers that the device needs power. If it doesn't light with a fancy charger try a different one. If you enjoy these videos you can help support the channel with a dollar for coffee, cookies and random gadgets for disassembly at:- https://www.bigclive.com/coffee.htm This also keeps the channel independent of YouTube's algorithm quirks, allowing it to be a bit more dangerous and naughty. #ElectronicsCreators