I'm using i3 wm and noticed it doesn't send any notification when my battery gets low. I had that kind of troubles on different desktop environments before and here is a simple script to fix it.

I used notify-send to send notifications and psutil to get battery details.

Run notify-send -v to check is notify-send installed.

If it isn't, you can run sudo apt-get install libnotify-bin for Debian based distros.

You can run pip install psutil to get psutil if it isn't installed already.

1- Clone this repo to your local.

git clone git@github.com:serkan-bayram/low-battery-notifier.git

2- Set main.py to run at startup. If you are using i3 wm you can simply put

exec --no-startup-id python3 /path/to/script.py

in your i3 config.