Compatible with iOS 8 and 9
For those times when a simple percentage isn't enough
This unlocks the hidden battery usage menu Apple uses internally during development (found in Settings->General->Usage->Battery Usage). It contains much more detail than the standard menu, check the screenshots for an example.
At the bottom there's an option to show/hide daemons from the list. The "Save For Demo" button generates a plist representation of the data and stores in "/var/mobile/Library /Logs/BatteryUIDemos"