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If you're an iPhone owner then you've certainly heard of the Mophie Juice Pack. It's emerged as the external battery pack of choice for any iPhone owner needing more untethered power than Apple can provide from its non-removable batteries. But what about all those feisty upstarts? Can they compete in terms of design, functionality, and price? Let's find out. We put two iPhone 4 external battery pack cases -- the Mophie Juice Pack Air and Mili PowerSpring 4 -- head to head to see how they perform. Both promise to double the iPhone 4's 1420mAh li-poly battery life without adding too much bulk. And surely the 1600mAh capacity Mili outlasts the 1500mAh Mophie, right? You'd be surprised.

Continue reading Mophie Juice Pack Air vs. Mili PowerSpring 4 review

Mophie Juice Pack Air vs. Mili PowerSpring 4 review originally appeared on Engadget on Wed, 22 Sep 2010 11:33:00 EDT. Please see our terms for use of feeds.

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