October 10th 2021


AUR Github

Batsignal is a lightweight battery daemon written in C that notifies the user about battery states. It makes use of lib-notify to send notifications of battery levels

Because you clicked on this

If you clicked on this purely because you wanted to know your device’s battery level. Here is what you are most likely looking for:

cat /sys/class/power_supply/BAT0/capacity

Thank me later. Oh, and yes, I would argue searching in /dev/BAT0 would have been logical aswell but I guess its not there :shrug:


On arch based systems

yay -S batsignal

Next you want to create a systemd service to auto-start the service when the device is booted. Create the following file under /usr/lib/systemd/system/batsignal.service

Description=Lightweight battery daemon

ExecStart=/usr/bin/batsignal -f 90 -w 20 -c 10 -d 3


After this it should be as simple as

systemctl enable --now batsignal