The rechargeable AVP7 NiMH Extra Battery Packs are compatible with these models: GXT1000, GXT1050, GXT1091, GXT300, GXT310, GXT325, GXT400, GXT444, GXT450, GXT500, GXT550, GXT555, GXT565, GXT600, GXT635, GXT650, GXT656, GXT661, GXT700, GXT710, GXT720, GXT735, GXT740, GXT745, GXT750, GXT756, GXT757, GXT760, GXT771, GXT775, GXT781, GXT785, GXT789,GXT795, GXT797, GXT799, GXT800, GXT808, GXT850, GXT881, GXT900, GXT950, GXT991, HH54, LXT210, LXT303, LXT305, LXT310, LXT350, LXT410, LXT435, XT511. Cancer and Reproductive Harm- www.P65Warnings.ca.gov. Type: Battery Packs.