CtcStore 1900mAh External Backup Battery Charger for iPhone (Rechargeable)-WORKS FOR 3GS, iPhone 3G, 2G, iTouch, iPod Nano Compatibility: iPod nano 1G, 2G, 3G; iPod classic 4G, 5G, 5.5G, 6G; iPod touch; iPhone Can charge your iphone and battery pack at the same time using AC/USB power cable Charges your iPhone from 10% to 100% in just 2.5 hours. Remove the battery and your iPhone is charged 100% 1900 mAh battery, strongest clip on battery in the world with no cables for the iPhone. Excellent quality with high-end parts. Small enough to keep connected to your iPhone or iPod