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Best Buy: Third Rail Rechargeable Smart Battery and Case for Apple® iPhone® 4 and 4S Black 60-2765-05-BB
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Mophie Juice Pack Plus iPhone 4 Battery Case Review — Gadgetmac
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Mophie Juice Pack Pro rugged iPhone battery pack 'exceeds military specifications,' available for $129.95 - The Verge
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Sandberg BatteryCase for iPhone 4/4S delivers more bang for your buck
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Review: Weak battery aside, Apple's iPhone 6s Smart Battery Case isn't as dumb as it looks - 9to5Mac
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