How To Fix A Drained Iphone Battery. Alternatively you can simply send your iPhone in using apple care or to another certified repair shop as this should not be occurring unless you have a very old Lithium ion battery or you have caused water damage to your phone. Press and hold down the OnOff button on the right side.

Open Settings in your iPhone. If the iPhone says it has detected your iPhone then you can restore your iPhone as needed to help fix the battery from not turning on after charging it overnight. I advice you to just plug it in and leave it alone.
Force restarting your iPhone can clear errors and fix battery drain issues after updating to iOS 15.
If the iPhone says it has detected your iPhone then you can restore your iPhone as needed to help fix the battery from not turning on after charging it overnight. StarzSoft Fixcon is one of the best iOS system repair. Apples iOS 146 brought new features and bug fixes to your iPhone but users are reporting a problem with battery life. For iPhone 6 and later iOS 113 and later add new features to show battery health and recommend if a battery needs to be replaced.
