Battery preservation
Should I turn off my iPhone 8 every day to preserve the battery? My son thinks so. The problem is that Screen Time is buggy and it frequently reverts to turning off the screen time if the phone is turned off.
iPhone 8
Question marked as
Top-ranking reply
No, you should NOT turn off your phone to preserve battery, unless it will be off for several days. It doesn’t save much, because the phone will need to “play catch-up” when you turn it back on to update all of the content that changed while it was off.
The absolute best way to get maximum use on a charge, as well as slow the decline of battery capacity long term is to enable Optimized Battery Charging (Settings/Battery/Battery Health) and charge the device overnight, every night. The battery will fast charge to 80%, then pause. During the nighttime pause the phone will use mains power instead of battery power, allowing the battery to “rest”, and thus reducing the need to charge the battery quite as often. The phone will resume charging to reach 100% when you are ready to use your phone; it will “learn” your usage pattern. If you enable iCloud Backup (Settings/[your name]/iCloud - iCloud Backup) the phone will back up overnight also, assuring that you can never lose more than the current day’s updates. Here's more information→About Optimized Battery Charging on your iPhone - Apple Support