About this replacement
Designed for Worx, DeltaFox, Rockwell devices. Compatible models include WG151.5, WG251.5, WG540, WG151, WG151E, WU287, WU381, WX163, WG251, RW9161, WG151E.5, WG251E. Replacement part numbers include WA3512, WA3511, WA3512.1, WA3523, WA3516, WA3551.1, WA3572, RW9351.1. Key specifications: 18V, 4000mAh, Li-ion.