I'm trying out the basic version of battery bar right now. Seems good as far as reporting goes. But you can't mess with any settings with free version.
As for powercfg.exe, I found a few of those applications in my file explorer. Not sure which one to use. Plus clicking on them flashes black box then disappears. Can't find where the info is dumped to like machistmo showed.
You need to run these in a command prompt (they don't have a GUI).