flipCHARGE iPhone Backup Battery
The flipCHARGE rogue gives you instant power for your iPod or iPhone. It's capable of recharging your battery up to 100% and its flush-folding USB cable and dock connector allow you to sync your device while charging. Smaller than an iPhone the flipCHARGE rogue even includes a carabiner clip so you can attached it to nearly anything."
Extremely powerful 1800mAh lithium-polymer rechargeable battery. When completely drained, the battery pack can be plugged in for approximately 4 hours to get fully recharged. Compatible with iPod touch (3rd and 4th generation), iPod nano (5th and 6th generation), iPhone 4 and iPhone 3GS.