HQRP Battery for Insignia NS-4V24 NS-8V24 Pilot 4GB 8GB Video MP3 Player E4H04-1-R E4H041R + HQRP Coaster HQRP&reg; Rechargeable Battery plus HQRP&reg; Coaster; Battery Voltage: 3.7V; Capacity: 560mAh; Li-Pol; 100% compatible with Original Battery; 200 Days warranty!