MiLi HIC232000 Power Spring 4 2000 mAh Capacity Extended Battery for iPhone 4 -Verizon and AT&T Versions- Retail Packaging - Black/Silver Newest release: 2000 mAh, 25% more capacity than 1600 mAhm, Technical Specifications: Input: DC 5V/500mA, Capacity: 2000mAh The worldwide highest capacity external battery for iPhone 4 Product Dimension: 124 x 65 x 18 mm Standby time: Up to 450 hours. Talk time: Up to 7.5 hours on 3G, Up to 16.7 hours on 2G Package Contents: MiLi Power Spring 4, Mini USB cable, User's Manual