UL104 - Ni-MH, 3.6 Volt, 850 mAh, Ultra Hi-Capacity Battery - Replacement Battery for Panasonic HHR-P104, Type 29 Cordless Phone Battery Replacement Battery for Panasonic HHR-P104, Type 29 - Ni-MH, 3.6 Volt, 850 mAh. 100% compatible with your OEM battery - 3 year warranty. Made with high quality Japanese cells. Synergy Digital is a Registered Trademark