Hitech - Replacement N4HKGMA00001, P511, TYPE24 Cordless Phone Battery for Many Panasonic KXTG series and Other Panasonic Phones Capacity: 850mAh Voltage: 3.6V Chemistry: Ni-Cd See description for list of compatible cordless telephones Replaces Panasonic P-P511A, P-P511A/B, and HHR-P402A batteries