The purpose of Mophie's Juice Packs are to give your iPhone that extra boost when its battery is running low. The Mophie Juice Pack Air and its beefier cousin, the Juice Pack Plus for the iPhone 4 are no different, each providing over five hours of additional Internet and talk time over 3G. Despite initially feeling bulky, we found plenty of reasons to keep either the Air or Plus attached to our iPhone or stored in our messenger bag for those hard partying nights.
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