100% Battery Health but 'Under Service' in Parts and Service History
The "parts and service history " says that Battery is under service even though the battery health is 100%
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iPhone 12 mini, iOS 18
If you have never replaced the battery in the iPhone 12 mini in your profile, there is no way that the Battery Health is 100%.
Make an appointment at the Apple Store or take the phone to an authorized Apple service shop to have the battery checked, tested, and likely replaced.
Genius Bar Reservation and Apple Support Options - Apple