On your iPhone if your optimized battery charging is not working and consuming more battery even after optimized battery charging is enabled then you need to re-enable optimized battery charging and restart your iPhone and wait for a week to optimize battery charging to work on iPhone.
Optimized Battery charging option is only available after iOS 13 update and it is enabled by default.which helps and improves iPhone battery and performance and maximizes battery performance and its lifespan.
You need to enable optimized battery charging on your iPhone and to do that follow below steps.
Step 1: Launch setting
Step 2: Scroll down to the battery and tap on it.
Step 3: Tap on Battery Health
Step 4: Toggle Optimized battery charging is turned on.
Step 5: If it is already turned on just go ahead and refresh it.
Step 6: To refresh -> Turn off your optimized battery charging.
Step 7: Restart your iPhone and then turn on optimized battery charging.
Once you have turned on optimized battery charging then the iPhone takes 5 to 6 days to learn how your battery is consumed and it will optimize accordingly. Use optimized battery charging only when you connect your iPhone to a charger overnight or else turn it off.
To turn off optimized battery charging -> Settings -> Battery -> battery health -> Optimized battery health.
By default optimized battery charging is enabled and it will reduce the aging it learns from your daily charging routine, so it can wait to finish charging past 80% until you need to use it.
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When you enable and turn on optimized battery charging you will see an optimized battery charging icon when your screen is locked and when your iPhone is fully charged it will show an icon.
If your optimized battery charging is not active or not turning or not enabling then you need to enable other options as well like location services, System customization and significant locations.
To enable location services -> settings -> Privacy -> Location Services -> Location services turn it on.
To Enable System Customization -> Settings -> Privacy -> Location Services -> System Services -> System Customization
Launch settings -> Privacy -> Location Services -> System Services -> Significant Location -> Tap on Significant locations.