HQRP Phone Battery for V-Tech/VTech CS5121, CS5121-2, CS5121-3, CS5121-4, CS5122-3 Cordless Telephone plus Coaster HQRP&reg; Rechargeable Battery plus HQRP&reg; Coaster; Battery Voltage: 3.6V; Capacity: 350 mAh; Ni-Cd; Keep in touch with friends and family and never miss a conversation; Compatible with Original Battery; 200 Days warranty!