Vtech 9127 Cordless Phone Battery 3 1/2AA/D - 3.6 Volt, Ni-MH 700mAh - Cordless Phone Replacement Battery Replacement Battery for Sony BP-T27- Ni-MH, 3.6 Volt, 700 mAh. 100% compatible with your OEM battery - 3 year warranty. Made with high quality Japanese cells. Synergy Digital is a Registered Trademark