batnotify

Notification script and systemd timer for triggering low battery notifications.

How it works

We query battery state and charge percentage by reading from:

• /sys/class/power_supply/BAT0/status
• /sys/class/power_supply/BAT0/capacity

If the battery state is "discharging" and the current charge percentage is less than the specified ${SAFE_BATTERY_LEVEL}, we trigger a notification using notify-send

Now we run the script using a systemd service file. In order to repeatedly check the status, we run a systemd timer for the corresponding service file.

Installation

# clone the repo
git clone git@github.com:arindas/batnotify.git
cd batnotify/

# install the relevant files
cp ./batnotify ~/.local/bin
cp ./batnotify.service ~/.config/systemd/user
cp ./batnotify.timer ~/.config/systemd/user

# enable and start the systemd service timer
systemctl --user enable batnotify.timer
systemctl --user start batnotify.timer

Uninstallation

# disable and stop the systemd service timer
systemctl --user disable batnotify.timer
systemctl --user stop batnotify.timer

See also

• poweralertd: Also handles power notifications for different wireless devices, in addition to main system power.