Empire Cordless Phone Battery 2.4 Volt, Ni-MH 1500mAh - Replacement For PANASONIC HHR-P506 Replacement Battery for Panasonic HHR-P506 - Ni-MH, 2.4 Volt, 1500 mAh. 100% compatible with your OEM battery - 3 year warranty. Made with high quality Japanese cells. Synergy Digital is a Registered Trademark