Official iPhone 4 / 4S Battery Replacement Video & Instructions - iCracked.com - YouTube
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:
China Parts for iPhone 4S Battery Replacement, Battery for iPhone 4S