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On the battery use screen, when the battery is full, you see a grey rectangle at the top with the total time on battery on it. When the battery is partially discharged, you'll see it's not a rectangle, but the top slopes down to the right; it's a graph. When you press on the graph it goes full screen and the legend and usage vs. time is below it. Very educational. Maybe someone who is rooted and can do screen captures can post an example here.
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