ULTRALAST Cordless Phone Battery Ni-MH, 2.4 Volt, 750 mAh - Ultra Hi-Capacity - Replacement for V-Tech 89-1330-01, 8300, ATT 3101, 3111, Uniden BT1011 Rechargeable Battery Replacement Battery for V-Tech 89-1330-01, 8300, ATT 3101, 3111, Uniden BT1011 - Ni-MH, 2.4 Volt, 750 mAh. 100% compatible with your OEM battery - 3 year warranty. Made with high quality Japanese cells. Synergy Digital is a Registered Trademark