Looking inside an iPhone 4/4S battery | Rip It Apart - Jason's electronics blog-thingy
Mobile Phone Battery 1420mah For Iphone 4 Battery 4s Battery Replacement Батарея Для Телефона Original Batterie Bateria - Mobile Phone Batteries - AliExpress
Amazon.com: OTTERBOX DEFENDER SERIES Case for iPhone 4/4S - Retail Packaging - Pink/Deep Plum : Cell Phones & Accessories
Apple iPhone 4 / 4s / 3Gs / 3G Car Charger by Cellet (Apple Certified) Also Compatible with iPad
Used iPhone 4 vs 4s: Which should you buy? | iMore
10 things you need to know about the iPhone 4S | VentureBeat
SOLVED: Differences between 4 and 4s batteries - iPhone 4S - iFixit