Griffin Technology PowerJolt Reserve

The Griffin PowerJolt Reserve gives you both a USB car charger and rechargeable backup battery. Power up your iPhone, iPod, MP3 player, and other USB rechargeable devices while you're in your vehicle using, the cigarette lighter or accessory socket. When you're not in the car the removable Reserve backup battery keeps your iPhone or iPod going. And, if you want, you can both charge your device and the Reserve battery at the same time.