Note: You can use the device while charging. Insert the Lightning end of the Lightning-to-USB cable into the port at the base of the device then then plug into the power adapter. Swipe down from the upper right corner of the screen to access the Control Center. Note: You can view the battery percentage in the Control Center. This shows how much battery life is left. When your iPhone is on, you’ll see the Battery indicator in the right corner of the Status bar. Note: Learn what to do if your device doesn’t charge when you plug it in. When the device is charged to 100% the battery indicator in the Status bar will appear solid green. When your device is charging, the Charging icon will appear on the iPhone battery indicator in the Control Center.

You can do this by visiting an Apple Store, or by talking to Apple's customer support online.IPhone X Series: Want a demonstration about charging your device? View a video about charging, power modes, and battery usage information.

If your iPhone is older and can't upgrade to iOS 11.3, then you can't check on battery health in Settings. However, you can ask Apple to run a diagnostic test on your battery for you. The iPhone will display this when the battery's capacity is below 80%, and it can significantly affect your phone's ability to work normally.

Your battery's health is significantly degraded.

You're likely going to see performance issues, like slower loading times. This message is an indication your battery is causing issues with your iPhone, and it might soon be time to upgrade. Performance management has been applied to help prevent this from happening again.

This iPhone has experienced an unexpected shutdown because the battery was unable to deliver the necessary peak power.

This means your battery is beginning to degrade, which may affect performance.

As your battery ages, you might see this message. Built-in dynamic software and hardware will help counter performance impacts that may be noticed as your iPhone battery chemically ages.This means that your battery is working normally and has the highest capacity available. Your battery is currently supporting normal peak performance.Here are some common messages you may see when you click through to the Peak Performance Capability section of the Battery menu in Settings. In the Peak Performance Capability section, you'll see a more detailed explanation of how your battery is doing. You can see the health of your iPhone's battery using the Settings app.

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