Maxboost iPhone 4S Battery Case/iPhone 4 Battery Case (1900mAH, Fits All Versions of Apple iPhone 4 & 4S) - Detachable Battery Charger Case External Rechargeable Battery Pack Charging Power Case | Amazon
Energizer Charging Case for iPhone, Made for iPhone 4S and iPhone 4 - Walmart.com
mophie Juice Pack Plus Battery Case for iPhone 4/4S - Black - Walmart.com
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
uNu Exera Modular Detachable Battery Case for iPhone 4S 4 - White | eBay
DX-4 Plus Battery Case (2400mAH) - iPhone 4/4s | myunu
monolith: iPhone 4 Case + Pocket Projector +Battery Rolled Into One | TechCrunch
Apple MFi Certified] PowerFlow iPhone 4/4S Battery Case (AP101) - Skiva
Battery cover for iPhone 4s, White
Best Buy: PhoneSuit Elite Battery Case for Apple iPhone 4/4S White 00223PNS
Amazon.com: Keystone ECO AmigoCase, Battery Holster & Protective Case for iPhone 4S/4, (Blue) : Cell Phones & Accessories
Original New Battery Cover For Iphone 4 4g Or 4s Replacement Back Housing Case Replace Or Repair - Mobile Phone Housings & Frames - AliExpress
DX-4 Battery Case (1700mAH) - iPhone 4/4s | myunu
PhoneSuit Elite Battery Case (for iPhone 4 and 4S) Review | PCMag