VINTRONS Cameron Sino600mAh Battery for Microsoft Zune 4GB, 8GB, 16GB, Flash, N59777, X814398-001 Capacity: 600mAh / 2.22Wh Type: Li-Polymer Volts: 3.7V Size : 43.00 x 33.80 x 4.20mm Certificated with ISO9001, RoHS & CE;