AA/AAA lithium iron phosphate battery charger

The casing and contacts are taken from the charger that comes with the Feishi NiMH battery. It is a two-string silly charger, which is very useless. Only the casing and shrapnel contacts are more useful and can be modified to support AA and AAA shapes. Standalone charger for batteries.

PCB:

This PCB is just an interface board and does not contain charging control circuit. With different charging control boards, it can be combined into various chargers such as lithium batteries, nickel metal hydride/nickel cadmium batteries, etc.

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Examples are as follows:

In another open source project that has been released https://oshwhub.com/napier/xt2059-san-gong-neng-chong-dian-xiao-ban has produced a lithium battery charging board that can modify the voltage, taking into account its own Usage rate, set to the default 3.6V lithium iron battery charging function.

You can also refer here