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On iOS 8, there is the battery usage screen showing an estimate of the battery use, per application.

It also has an entry for "Main screen". I assumed it was just displaying the main screen with the icons, but I got 40% of that during night, during which the screen was indeed off.

As such, what does "Main screen" refer to, exactly?

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    Did you receive notifications during night? Maybe this is why. Perhaps you could try do not disturb mode during nights.
    – jherran
    Commented Oct 29, 2014 at 11:24

1 Answer 1

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From https://www.apple.com/batteries/maximizing-performance/#ios:

Home & Lock Screen. This indicates that the Home screen or Lock screen was displayed on your device. For example, the display was awakened by pressing the Home button or by a notification.

  • If an app frequently wakes your display with notifications, you can turn off push notifications for the app in Settings > Notifications. Tap App and set Allow Notifications to Off.

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