Simple BASH Script to mind battery charge level.

batterdog.sh

#!/bin/bash

if [[ $(cat /sys/class/power_supply/BAT0/status) == "Charging" ]]; then
  exit
fi

charge=$(cat /sys/class/power_supply/BAT0/capacity)
icon="/usr/share/icons/HighContrast/32x32/status/battery-caution.png"

if [[ $charge < 10 ]]; then
  notify-send --icon=$icon "Critically low Battery level!" "Battery level is critically low!\nShutting down in 1 minute!"
  sudo shutdown -h +1
elif [[ $charge < 20 ]]; then
  notify-send --icon=$icon "Low Battery level!" "Battery level is low!\nCurrent Charge: $charge %"
fi

exit