HQRP Battery 2-Pack for Plantronics CT11 CT12 Cordless Headset Phone 63421-01 64376-01 + Coaster HQRP&reg; Two Rechargeable Long Lasting Batteries plus HQRP&reg; Coaster; Battery Voltage: 3.6V; Capacity: 800 mAh; Ni-Mh; Keep in touch with friends and family and never miss a conversation; ompatible with Original Battery; 200 Days warranty!