Ansmann Emergency Battery Pack for iPod and iPhone Product Description:

iPod and iPhone Power 24/7! 'Round the clock battery performance.

External Battery Pack for Apple I-pod series. Extends battery life by additional 20 hours on a single charge! Charge direct thru Apple power supply or via USB port of PC/MAC. Includes USB cable for charging!  

For use with iPhones, including 3G, 3S and iPhone 4 models,

iPod, iPod Video, iPod Photo, iPod U2, iPod mini, and iPod nano

 Ansmann Li-Ion rechargeable battery; output voltage 5V, output current max. 1000 mA, capacity: 7,9 WH (2200 mAh); charging time: 4-6 hours; life time: 500 cycles; operating temperature: approx. -10 - 40 C; dimensions 100 x 62 x 15 mm; weight 90g

Also - check out our Integrated Battery Cases for iPhone 4 and iPhone 3G/3GS