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3000 mAh iPhone 4 4S Battery Case Power Bank External Backup Battery Rechargeable Battery Extender Case with Built-in Viewing Stand Retail Packaging (Black & White) (Black): Amazon.co.uk: Electronics & Photo
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Amazon.com: MFI-Apple Certified - ibattz Mojo Vogue Removable Battery Case for iPhone 4 and 4S White 1700mAhX2 fits all version of iPhone 4S/4 : Cell Phones & Accessories
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