Specifications: Voltage: 12V Capacity: 3500mAh Battery type: Li-ion Weight: 219g per battery Replacement for Worx: WA3503, WA3504, WA3505, WA3509. Compatible with Worx: WU288 WX125, WX125.1, WX125.3, WX125.3 D-Lite, WX125.4, WX125.5, WX125.6, WX125.7, WX125.M WX126 WX128.2 WX283, WX283.3 WX284 WX382, WX382.2, WX382.3, WX382.4, WX382.7, WX382.M, WX382.M1, WX382.M2 WX521, WX521.1 WX540, WX540.3 WX673, WX673.3, WX673.M WX677, WX677.7 Package includes: 2Pcs 12V 3500mAh Li-ion Battery for Worx WA3503 WA3504 WA3505 WA3509 WX125 WX673.