Apple iPhone 4 - 4S Battery - Extended Piggy Back (Black)
Apple Iphone 4/4S Broken Battery Connector Repair Service – Outsource Repairs
SOLVED: Differences between 4 and 4s batteries - iPhone 4S - iFixit
PhoneSuit® iPhone 4 & iPhone 4S Battery Case
OEM Apple iPhone 4S Battery - ETrade Supply
Apple Repair iPhone 4S Battery Replacement Service
Looking inside an iPhone 4/4S battery | Rip It Apart - Jason's electronics blog-thingy
Apple iPhone 4 CDMA Plus 4S Battery Door with Frame - PhoneDoctors®
GENUINE Mophie Juice Pack Plus Battery Case for Apple iPhone 4 4S White 2000mAh | eBay
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
How To: Replace the Battery on your iPhone 4s! - YouTube