The new juice pack air allows iPhone 5 users to do more with their device on one charge, packing 1700 mAh to double the battery life of the device with the simple flip of a switch.

ENGADGET: Mophie Juice Pack Air brings an extra 1,700 mAh to iPhone 5 for $100

With Americans already packing an average of five charge cards, Saunders has been appealing to bankers like Davis by making his plastic smarter and thus more valuable in attracting customers.

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