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The 25A 3-cell rechargeable battery charger is used for 3-cell 18650 rechargeable batteries. The circuit has a separate charge function for each cell, automatic shutdown when full, short-circuit protection, over-voltage, and under-voltage.
3S 25A Lithium Battery 18650 Charger Quick Spec
Wiring diagram (also the silk screen at the back of the pc board.)