Vtech ia5879 Cordless Phone Battery Ni-MH, 3.6 Volt, 1500 mAh - Ultra Hi-Capacity - Replacement for AT&T, Panasonic, VTech 80-5071-00-00, RadioShack 23-298 Rechargeable Batteries Synergy Digital Replacement Battery for AT&T, Panasonic, VTech 80-5071-00-00, RadioShack 23-298 Ni-MH, 3.6 Volt, 1500 mAh. Made with high quality Japanese cells. 100% compatible with your OEM battery - 3 year warranty. Synergy Digital is a Registered Trademark