BATT-507 - Ni-CD, 7.2 Volt, 500 mAh, Ultra Hi-Capacity Battery - Replacement Battery for Panasonic HHR-P401, PANASONIC P-P507, TYPE 18 Cordless Phone Battery Replacement Battery for Panasonic HHR-P401, PANASONIC P-P507, TYPE 18 - Ni-CD, 7.2 Volt, 500 mAh. 100% compatible with your OEM battery - 3 year warranty. Made with high quality Japanese cells. Synergy Digital is a Registered Trademark