When I open the Battery Saver app, it shows me some percentage (e.g. 7.1%, or 1.1%, or <1%) after many apps.
What exactly do those percentages mean? Do they show battery usage? If so, what corresponds to 100%? The battery's total capacity? Or total usage by all apps?
How is it even possible to determine battery usage on a per-app basis? Does it simply measure total power consumption while the app is active? If so, wouldn't that also include activity by background processes? Or does it perhaps mean something else, like CPU usage?