I have made a very simple battery monitor for myself. I don't use a desktop environment, nor did I wish to install some power management program which would pull in lots of dependencies. So I wrote a little tool in C which, along with a systemd service file, runs at boot and monitors my laptop battery. https://github.com/Daerandin/sbatterymonitor Probably not the most useful tool for the rest of the Linux ecosystem, but I wanted to start small. Perhaps in time I'll have ideas that might be more useful for others. In any case, it's there for anyone interested in having a look.