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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.