First of all: Let phone drain battery completely until it’s off ( do this once a month ) Charge before it reaches 20% Unplug at 80% Turn off Background App Refresh Turn off Auto Brightness in Display settings and Accessibility Turn Off Siri Suggestions Privacy - Location Off Keep your brightness very low Make sure Bluetooth and Mobile data are off Turn off Exposure Notifications Just make sure you’re charging your battery properly. You don’t really have to charge it to 100% during the day, you can do that overnight. And you could turn off optimised battery charging of you want to. Hope this helps!