Battery Parameters-- Lithium-ion ,Voltage: 20V, Capacity: 4000mAh/4.0Ah, Wattage: 80W, Item Weight: 650g

Applicable Models -- Perfectly Compatible with Worx 20V Battery WA3551.1,WA3572,WA3553,WX390,WX176,WX178,WU268,WX166.4,WX372.1,WX800,WX802,WX678,WX550,WX523,WU531.9,WG894E,WG629E,WG329E,WG259E,WG169E,WG026.9,WG894E.9,WG546E.9,WG546E.9,WG546E

Battery Protections -- Made with high quality battery cells, Built-in protection against overcharge, over discharge, overcurrent provides short circuit protection and constant voltage circuit.

 LED Indicator -- Designed with LED indicator to check battery power level conveniently.