PowerBear® iPhone 4S / iPhone 4 - Rechargeable Battery Case with Built in External Power Bank (3,000 mah) - Black (Up to 2X the Power) comes with Free Screen Protector (24 MONTH
iPhone 4/4S Extended Battery Case Shoot-out - YouTube
PhoneSuit® iPhone 4 & iPhone 4S Battery Case
APPLE IPHONE 4 / 4S EXTERNAL BATTERY CASE WHITE 1.5Ah LI-POL + FREE SHIPPING - Walmart.com
PINK iPhone 4/4S Case-Battery Charger / Use Coupon Code 'SCRATCHPROOF' for FREE Front+Back Screen Protectors
MiLi Power Pack 4 3000mAh external battery pack for iPhone 4S / 4
Pin on 1200
MOBILAIR 1400mAh Powerbank External Battery Charging Case for iPhone 4 4S White | eBay