The Mophie 'Juice Pack' line of external chargers are the first external batteries to be Apple-certified to work with the iPhone 3G.
The 'Juice Pack 3G' is specifically designed for the iPhone 3G and, according to Mophie, passed the strict over-the-air performance tests by an Apple-designated test lab with flying colors. The 'Juice Pack 3G' is a rechargeable lithium polymer battery in the form of a non-slip, soft grip case that protects your iPhone and gives it some extra power.
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