HQRP Battery for MICROSOFT Zune 4GB 8GB 16GB, Zune Flash 4GB, Flash 8GB, Zune HSA-00001 HVA-00001 HSA-00003 HVA-00003 HSA-00005 HVA-00005 Digital Media MP3 Player + HQRP Coaster HQRP&reg; Rechargeable Battery plus HQRP&reg; Coaster; Battery Voltage: 3.7V; Capacity: 720mAh; Li-Ion; 100% compatible with Original Battery; 1 Year warranty!