Panasonic P-P501 Cordless Phone Battery Ni-CD, 3.6 Volt, 1000 mAh - Ultra Hi-Capacity - Replacement for Panasonic HHR-P506, HHR-P505 Rechargeable Battery Replacement Battery for Panasonic HHR-P506, HHR-P505 - Ni-CD, 3.6 Volt, 1000 mAh. 100% compatible with your OEM battery - 3 year warranty. Made with high quality Japanese cells. Synergy Digital is a Registered Trademark