SDCP-C308 - Ni-CD, 3.6 Volt, 900 mAh, Ultra Hi-Capacity Battery - Replacement Battery for AT&T, Panasonic, VTech 80-5071-00-00, RadioShack 23-298 Cordless Phone Batteries Synergy Digital Replacement Battery for AT&T, Panasonic, VTech 80-5071-00-00, RadioShack 23-298 Ni-CD, 3.6 Volt, 900 mAh. Made with high quality Japanese cells. 100% compatible with your OEM battery - 3 year warranty. Synergy Digital is a Registered Trademark