Created attachment 169516 [details]
PowerDevil with menu list opened

When a laptop is discharging, reliable value are around 3 or 6 or 9.

The easy way:
It would be nice to have the whole discharge curve, so just add these numbers in the menu list would help to have a better graph.
The hard way:
Another way (maybe more difficult) is to analyze time since discharge (and not stopping until battery is fully charged): it more automated but better for user experience.
The medium way:
Let the user enter a number value in a numeric field (limited to minimal value 1 and maximal value 24).

Thanks a lot