Are you looking for a longer battery life out of your iPhone 5? Then mophie is the answer for you.
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mophie – Juice Pack Helium Charging Case for Apple® iPhone® 5
Power your Apple iPhone 5 on the go with this mophie Juice Pack Helium 39368BBR charging case that features a rechargeable 1500 mAh battery. A toggle switch allows you to easily choose charge or standby mode.