HQRP Battery for Microsoft Zune 30GB / 1089/1090 / 1091 / JS8-00001 / JS8-00002 / JS8-00003 MP3 Player + Tool & Instal Manual +Screen Protector HQRP Replacement MP3 Player Battery plus HQRP Universal Screen Protector; Capacity: 720mAh; Battery Type: Rechargeable Li-Polymer Battery; No memory effect, the battery can be recharged without loss of capacity; 100% compatible with original battery and charger devices; 200 days warranty!