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USB Fever has this iPhone 3G compatible battery pack available for $44. The rated power capacity is 2,400 mAh which is a full 50% larger than competitors such as the Mophie. This slide on battery pack contains a built-in speaker for the phone as well as volume and power buttons. Like the Mophie you cannot synch through the battery pack - you’ll have to remove your iPhone and connect it directly to your computer in order to sync at the end of the day.

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USBFever - Portable power station for iPhone 3G - $43.99