We have featured a number of these battery packs for the iPhone before here at Geeky Gadgets, although you may not need one with the iPhone 4 as the battery seems to last a lot longer than the 3GS.
Mophie has added another iPhone battery pack to their range with the Mophie Juice Pack Plus, which is designed to work with both the CDMA iPhone 4 and the GSM iPhone 4.
The Mophie Juice Pack Plus features a 2,000 mAh battery, which is designed to give your iPhone 4 double the battery life, it is available in a range of different colors for $99.95 from Mophie.
Source Slippery Brick
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