How to revive a 3.7 V Li ion battery?

Use a variable power supply set to the battery’s nominal voltage (usually 3.7V for lithium-ion cells) and limit the current to a safe level (e.g., 100-200 mA). Connect the battery to the power supply for a few minutes to raise its voltage to a level where the regular charger can recognize it.

BYD 140Ah 3.7V Prismatic Li-ion Battery for Solar Storage & EV …

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