Sanyo 3KR-600AAL Cordless Phone Battery 1X3AA/C - 3.6 Volt, Ni-CD 600mAh - Cordless Phone Replacement Battery Replacement Battery for 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