I had a genious thought. These Li-ion protection boards are about 0.14 euro,
while there are also these 0.17 euro TP4056 1A Li-ion chargers including the protection circuit, which I had still lying around.
So I quickly hooked it up and tested it
And it works well. Then I designed a new PCB and ordered from JLCPCB and soldered it.
And it works as expected.
Now I feel happy
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