MiLi Power Pack HI-C10 External Battery 2000 mAh Capacity for iPhone 2G, 3G, 3GS, iPod Touch -Black The worldwide highest capacity external battery for iPhone Technical Specs - Input: 5V-0.5A, Output: 5V-0.5A, Capacity: 2000 mAh(Li-Pol) Product Dimension: 126  66  23 mm Standby Time: Up to 390 hours, Talk Time: Up to 65 hours on 3G/Up to 135 hours on 2G, Package Contents Included: MiLi Power Pack, Mini USB cable, User?s Manual Internet Use: Up to 65 hours on 3G/Up to 8 hours on Wi-Fi, Audio Play: Up to 31 hours, Video Play: Up to 9 hours