Panasonic KX-TG2770 Cordless Phone Battery Ni-CD, 3.6 Volt, 850 mAh - Ultra Hi-Capacity - Replacement for PANASONIC P-P511, TYPE 24 Rechargeable Battery Replacement Battery for PANASONIC P-P511, TYPE 24 - Ni-CD, 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