HQRP Phone Battery for AT&T LUCENT CL84309 EL51109 EL51209 EL51359 EL52109 SL82308 EL52409 Cordless Telephone plus Coaster HQRP&reg; Battery plus HQRP&reg; Coaster; Battery Voltage: 2.4V; Capacity: 850 mAh; Ni-Mh; Nickel Metal Hydride battery pack; Compatible with Original Battery; 1 Year warranty!