HQRP Battery for MICROSOFT Zune X814398-001 HVA-00007 HVA-00018 HVA-00020 HSA-00026 HSA-00028 HSA-00029 HVA-00030 N59774 N59777 N59779 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!