How to Check Your iPhone's Battery Health

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Use this guide to check the health of your battery and whether your iPhone is operating at peak performance. If not, it may be time to replace the battery.

This guide was created on an iPhone X, but can be used on any iPhone 6 or newer, running iOS 11.3 or higher.

手順1 How to Check Your iPhone's Battery Health

How to Check Your iPhone's Battery Health, How to Check Your iPhone's Battery Health: 手順 1、 1の画像 1

In order to proceed with this guide, your device must be running iOS 11.3 or higher.
Open the Settings app.

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Scroll down and select Battery.

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Select Battery Health.

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Maximum Capacity displays the total charge capacity of the battery compared to when the device was brand new.
Over many charge and discharge cycles, this number will gradually drop.
Your iPhone should continue to work fine, albeit with shortened battery life. Apple typically recommends replacing the battery once it degrades to 80% or lower.

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Peak Performance Capability tells you whether your battery can still supply sufficient power for the iPhone's most intense processing tasks. Normal peak performance is what you're aiming for.
If it says your iPhone has experienced an expected shutdown, that means your battery couldn't supply the needed power quickly enough, and the system shut down as a result.
Your iPhone will throttle its own performance—slowing itself down—in order to prevent further unexpected shutdowns. This can be disabled to manually enable peak performance.
Once you disable performance management, you cannot enable it again. It is automatically enabled after an unexpected shutdown.
Once your battery falls below a specific threshold (typically 80%), you will be notified that your battery's health is significantly degraded.
Follow this guide to replace your iPhone X battery, or click here for other iPhone models.