Cables Unlimited BatteryBoost for iPhone 3G & 3GS 71% OFF $19.99 & FREE SHIPPING!

Brilliant... in the thickness of the hard case, the BatteryBoost has a rechargeable battery doubling the autonomy of your iPhone 3G or iPhone 3GS. Simply slide your iPhone 3G or iPhone 3GS into the BatteryBoost and gain a couple of hours of battery life. Plug your original charger cable into the BatteryBoost to charge your device and the extra battery at the same time.