Lenmar Cellular Phone Battery for Audiovox CDM-9000, 4000, and 4500 Series Fits Audiovox CDM-4000, Audiovox CDM-4500, Audiovox CDM-9000 (See description for additional Cell Phone Model fits) Replaces Audiovox BTR4000 3.7 Volts, 1150mAh Capacity Lithium-Ion 2 Year Warranty