By Gadjo Cardenas Sevilla
As the iPhone gains more features and apps that conveniently make it a communications device, handheld computer, still and video camera and game console; the one aspect that will take a hit is battery life. Having a sealed-in (read: non-user replaceable) battery, means that intrepid iPhone users will need to consider either an external battery or an integrated battery case. Mophie's Juice Pack Air for the iPhone 4 is a lightweight, elegant and smart solution which doubles battery life without adding much bulk.
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