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:
Battery for iPhone 4S 1430mAh
Homemade iPhone 4s battery from a 18650 : r/techsupportmacgyver
iPhone 4S Replacement Parts, Batteries, Repair Parts