I've not seen this posted, but there's a clock icon next to the 24 hours/7 day toggle, when you tap it, it shows a breakdown of actual time on screen vs background.
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Nice bit of detail.
It's been there since the first Developer Preview.
That's a nice little feature.

Yea. It's good for that little bit of detail. I had a rogue app killing my battery, It was using background, so I killed background app refresh, cured that ill.![]()
Get the Battery Doctor App. It has a few nice features that give you enough info to figure this kind of stuff out.
Can anyone explain why Facebook is allowed to accumulate many hours of background time when I have Background App Refresh disabled? Outside of BAR an app can run in the background for VoIP, audio, location, but I'm pretty certain FB is not using any of these privileges, so what's the deal?
Terrible it may be, but I'm more interested in a technical explanation for how it is even possible, as Apple are pretty strict about the use of certain privileges to run in the background. All I can think is it possible registers as VoIP because its sister Messenger app can take calls. But the main app shouldn't be classed as VoIP!Because it's a terrible app. I would never leave it in my app switcher. It gets closed right away after use for this very reason.
I'm looking at More > Discharge Rank but i don't know how to interpret the 'Level of power usage'.
The only thing i right now see is that the battery (doctor app?) is the only application which is indicated as being used.