Just curious, do these triggers affect battery in any way? Do they run some scripts to check battery charge?
They listen to system events, which means the comparison logic is only triggered when the battery percentage really changes.
Thus the the effect on battery is effectively zero. (However of course every code that runs on your machine does have SOME effect on battery :-))
That's interesting! Is there any way to use this logic to display battery percentage in a menubar icon?