Vtech DS6521-2 Cordless Phone Battery 2xAAA 2.4V Ni-MH 750mAh - Cordless Phone Replacement Battery Replacement Battery - Ni-MH, 2.4 Volt, 750 mAh. 100% compatible with your OEM battery - 3 year warranty. Made with high quality Japanese cells. Synergy Digital is a Registered Trademark