How to Fix or Repair Faulty IPhone Battery

Turn your iPhone or iPad off.Hold down the “Home button” and plug it into your computer. Continue holding the “Home button” until the screen telling you to connect to iTunes shows up.Click “OK” when iTunes say iPhone or iPad is in Recovery Mode and needs to be restored before using it.Select Restore iPhone or Restore iPad.

https://www.elchaml.com/2018/01/blog-post_20.html