Original Battery for Apple iPhone 4 Mobile Battery with 6 Month Warranty and high Capacity Battery Backup.Carefully Check Your Phone Model and Purchase.(for iPhone 4) : Amazon.in: Electronics
How to Take Apart an iPhone 4 or iPhone 4S - Replace Battery or Glass Back - Disassemble Your iPhone - YouTube
Looking inside an iPhone 4/4S battery | Rip It Apart - Jason's electronics blog-thingy
iPhone battery just popped off the back cover : r/pics