1300mAh Slim Extended Battery fits AT&T 8900, 8925 Tilt, Tilt 8925, HTC TyTN II, P4550, Kaiser, Kaiser100, Kaiser 110, Kaiser 120, T-Mobile MDA Vario III, Vodafone v1615, VPA Compact V series High Quality, high capacity, light weight rechargeable DC 3.7V Li-Ion 1300mAh battery. Longer battery life than the original battery that comes with the PDA. Best replacement for the original AT&T 8900, 8925 Tilt, Tilt 8925, HTC TyTN II, P4550, Kaiser, Kaiser100, Kaiser 110, Kaiser 120, T-Mobile MDA Vario III, Vodafone v1615, VPA Compact V series battery pack. No memory effect. Can be charged or discharged as needed without loss of capacity. Overcharge protection, with built-in battery life microchip.