What electrical circuit is inside of many rechargeable batteries?

Описание

How does a lithium battery protection circuit work? Why my battery shows 0V? Why are there 3 pins?

Links:
- Battery protection chip datasheet: S-8261 G2JZ https://www.ablic.com/en/doc/datasheet/battery_protection/S8261_E.pdf
- Dual N-Channel MOSFET: http://pmob35624.pic26.websiteonline.cn/upload/uc1870+ver1_x76b.pdf

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