The Valken 2-3 Cell Li-Ion Digital Display Smart Charger is a balancing 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. This lithium airsoft charger will safely charge both lithium ion and lithium polymer airsoft batteries safely and efficiently. Balance ports support the 7.4v, and 11.1v, which smart balances each individual cell to ensure maximum life. They have an extremely compact design, and the digital screen shows battery voltage capacity and percentage charged. The LiPo charger also features reverse polarity and short circuit protection built in, as well as over-charge and over-current protection.