Att TL7612 Cordless Phone Battery Li-Pol, 3.7 Volt, 240 mAh - Ultra Hi-Capacity - Replacement for AT&T BT191545 Rechargeable Battery Synergy Digital Replacement Battery for AT&T BT191545 Li-Pol, 3.7 Volt, 240 mAh. Made with high quality Japanese cells. 100% compatible with your OEM battery - 3 year warranty. Synergy Digital is a Registered Trademark