How to open iPhone 4 to Replace Battery and Remove SIM Card
How to Replace iPhone 4 and iPhone 4S Battery: EveryiPhone.com
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: