Battery health
Is is possible to increase battery health if so how?
iPhone 12 Pro, iOS 14
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No, but you can do your best to keep batteries going for as long as you can.
To learn about 'Maximizing Battery Life and Lifespan', click here --> http://www.apple.com/batteries/maximizing-performance/
Click on this link to read 'About Optimized Battery Charging on your iPhone' --> https://support.apple.com/HT210512