Teardown of Apple's iPhone 4S reveals larger battery, new baseband chip | AppleInsider
Complete Replacement Battery Kit for iPhone 4S + Extra Accessories – Cell Phone DIY
Original Battery 4s for Apple iPhone 4S A1431, A1387, A1387 Mobile Battery with 6 Month Warranty and high Capacity Battery Backup.Carefully Check Your Phone Model and Purchase. (for iPhone 4s) : Amazon.in:
Iphone 4s Replacement Battery
Battery for Apple iPhone 4S - by Raz Tech – Raz Technology (Pty) Ltd.