Lithium Ion Cell Protection - Digi-Key
2015-12-14u2002·u2002Lithium batteries can be safely charged to 4.1 V or 4.2 V/cell, but no higher. Overcharging causes damage to the battery and creates a safety hazard, including fire danger. A battery protection circuit should be used to prevent this. Over-discharge. Lithium batteries are completely empty when discharged to 2.5 V/cell.
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