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Best Buy: PhoneSuit Elite Battery Case for Apple iPhone 4/4S White 00223PNS
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PhoneSuit® iPhone 4 & iPhone 4S Battery Case
Mophie Juice Pack Plus Protective Battery Case for iPhone 4/4S (Black) (Certified Refurbished) - Walmart.com
PhoneSuit Elite Battery Case (for iPhone 4 and 4S) Review | PCMag
Exera Modular Detachable Battery Case for iPhone 4S 4 - White — Beach Camera
