Use this guide to check the health of your battery and whether your iPhone is operating at peak performance.
This guide was created on iPhone X, but can be used on any iPhone 6 or newer, running iOS 11.3 or higher.
Open Settings app.
Navigate to Battery in Settings app.
Select Battery Health (Beta).
Maximum Capacity shows you the total charge capacity of the battery compared to when the device was brand new.
Normal peak performance is what you're aiming for.
When your iPhone has experienced an expected shutdown the performance is throttled to prevent further shutdowns. This can be disabled to manually enable peak performance.
Once your battery falls below a specific threshold (typically 80%), you will be notified that your battery's health is significantly degraded.
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