HQRP 3600mAh Battery for Sonos Controller 100 CB100 CR100 CP-CR100 URC-CB100 Wireless HiFi System + HQRP Coaster HQRP&reg; Rechargeable Battery plus HQRP&reg; Coaster; Battery Voltage: 3.7V; Capacity: 3600 mAh; Li-Pol; 100% compatible with Original Battery; 1 Year Warranty!