NEC DTR-4R-1 Cordless Phone Battery Ni-MH, 3.6 Volt, 750 mAh - Ultra Hi-Capacity - Replacement for UNIDEN BT-930 Rechargeable Battery Replacement Battery for UNIDEN BT-930 - Ni-MH, 3.6 Volt, 750 mAh. 100% compatible with your OEM battery - 3 year warranty. Made with high quality Japanese cells. Synergy Digital is a Registered Trademark