First we need to make sure our ios is up to date (you can check it in automatic updates).
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2. Then we open the Settings option in the phone.
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3. Click to enter the setting screen and drop down the screen.
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4. Locate and click the battery option.
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5. After clicking, you will enter the battery screen. In the screen, click the option \"Battery Health\".
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6. Turn off the switch on the right of the \"Optimize Charge\" function on the interface.
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That's how the iPhone turns off the \"Optimize battery charging\" feature.