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.
Charges iPhone, iPod, MP3 players, and other USB chargeable devices
Reserve backup battery is interchangeable with PowerBlock Reserve AC Charger
Note:
Reserve Battery works with Dock Connector iPod models. The headphone jack of iPod touch and iPod nano is temporarily unavailable while charging with detachable Reserve battery
Removable backup battery provides hours of additional use for iPhone and iPod