Sony SPP-A973 Cordless Phone Battery 3.6 Volt, Ni-CD 600mAh - Replacement For SONY BP-T23 Cordless Phone Battery Replacement Battery for Cidco CL990, SONY BP-T23 - Ni-CD, 3.6 Volt, 600 mAh. 100% compatible with your OEM battery - 3 year warranty. Made with high quality Japanese cells. Synergy Digital is a Registered Trademark