HQRP Battery compatible with Altec Lansing iM600 iM-600 iMT-520 iMT520 inMotion Digital Speaker System plus HQRP Coaster HQRP&reg; Rechargeable Battery plus HQRP&reg; Coaster; Battery Voltage: 3.7V; Capacity: 2200 mAh; Li-Ion; 100% compatible with Original Battery; 200 Days warranty!