Snow Joe + Sun Joe iBAT40 iON EcoSharp 40 V 4.0 Ah Lithium-Ion Battery 40 V lithium-ion technology  High capacity cells with no-fade power for maximum job performance No memory effect  Charge whenever you want without having to drain the battery or wait for full charge before use Eco-friendly - Zero emissions for cleaner air Reliable performance  4.0 Ah (160 Wh) capacity provides up to 50 minutes of whisper-quiet run-time For use with all Snow Joe and Sun Joe cordless iON model