EM-CPH-401B - Ni-MH 3/320/B (clover), 3.6 Volt, 320 mAh, Ultra Hi-Capacity Battery - Replacement Battery for Rechargeable Cordless Phone Battery Replacement Battery for Rechargeable - Ni-MH 3/320/B (clover), 3.6 Volt, 320 mAh. 100% compatible with your OEM battery - 3 year warranty. Made with high quality Japanese cells. Synergy Digital is a Registered Trademark