Motorola RAZR V3 GSM Lithium-Ion Extended Replacement Battery 1300mAh 3.7V with Black Extended Battery Case Cover (NOT compatible CDMA Verizon - Sprint and Alltel) NOT compatible with Motorola RAZR CDMA V3C from the following carriers: Verizon, Alltel, Cricket!!! Extended Lithium-Ion battery suitable for Motorola GSM RAZR V3 Provides extended talk and standby times over standard capacity batteries Advanced lithium-ion technology keeps phone working at optimum performance 3.7V 1300mAh Extended battery must be charged for 8 hours before first use. Check compatibilty list below