Over-charged and over-current protection Valken 2-3 Cell Lipo Compact Balancing Smart Charger (Usa) – East LiPo Li-ion Charger Valken Li-Ion 11.1V 3000mAh Split Airsoft Battery (Deans) - US Airsoft 18650 Battery Charger The Valken 2-3 Cell Li-Ion Digital Display Smart Charger is a smart charger for lithium airsoft batteries. The Li-ion charger comes with its own power supply, and charges Li-ion battery packs at 1A through 3-pin, or 4-pin charging ports Reverse polarity and short-circuit protection Valken Airsoft Li-Ion/Lipo Smart Battery Charger - Digital Display for 2-3 Cell Batteries Automatic constant current, constant voltage charging, reverse Polarity and short-circuit protection, over-charged and over-current protection, applicable for LiPo and Li-ion battery pack Automatic constant current, constant voltage charging, reverse Polarity and short-circuit protection, over-charged and over-current protection, applicable for LiPo and Li-ion battery pack.