Uniden BT925 Cordless Phone Battery Li-Ion, 3.6 Volt, 720 mAh - Ultra Hi-Capacity - Replacement for Uniden BT-925 Rechargeable Battery Replacement Battery for Uniden BT-925 - Li-ion, 3.6 Volt, 720 mAh. 100% compatible with your OEM battery - 3 year warranty. Made with high quality Japanese cells. Synergy Digital is a Registered Trademark