The iPhone's lithium-ion battery typically has a longer life when it is not fully charged. Apples optimized charge of the battery This feature (loosening with iOS 13) keeps the battery below 80% until a full charge is needed, which reduces unnecessary aging of the battery. Here's how to activate it.
To start, open the "Settings" application on your iPhone. If you can not find the icon, swipe down on your home screen and use the Spotlight search to find the application.
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Scroll down and choose the "Battery" option.
Select "Battery Status".
Press the button next to "Charge Optimized Battery".
Your iPhone will now begin to analyze your charging routine to determine when it should fully charge its battery. If you want to make sure your smartphone is fully charged, follow these steps and disable the optimized charge function of the battery.