HQRP Telephone Battery for Panasonic KX-TG5230 KX-TG5240 KX-TG5243 KX-TG5428 KX-TG5480 KX-TG5561 Cordless Phone System plus Coaster HQRP&reg; Battery plus HQRP&reg; Coaster; Battery Voltage: 3.6V; Capacity: 850 mAh; Ni-Mh; Nickel Metal Hydride battery pack; Compatible with Original Battery; 1 Year warranty!