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Battery usage: keep track of battery usage | iOS 11 Guide

To find out what apps are hitting the battery life hardest, open Settings and tap Battery.

By default it displays the information for the Last 24 Hours but you can tap the Last 7 Days option to see a longer timeline.

The percentage displayed will give you an idea of what apps are using more of your battery and you can try to avoid using those apps if you’re low on battery.

You can also press the clock icon to see how long each app has been open on your screen and how long it has been active in the background.