How can I make the low battery message appear on top of all running windows?
For example it happened that I watched a movie and the computer suspended because the battery was low, but the warning messages were not visible while watching the movie.
SnapOverflow
There is no such feature.
If you want this you will need to code it yourself by hacking the software that is used to create and show themes. And I believe you will need alot of coding experience to pull this of.