DIY 3.7v Battery protection Module (from old mobile batteries) [E9]

These circuits are most important for '18650' batteries because if we discharge them deeply they loses its capacity quickly and may not able to charge them again. so if we add this circuit (BMS) it will cutoff's the o/p supply when the battery is lower at a particular voltage in my case it cutoff's at 2.35v and it also works as short circuit protection.

can we repair a laptop battery:- https://youtu.be/o0m8C9d79KI

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