#!/bin/bash
BATTERY_LEVEL=$(upower -i $(upower -e | grep 'BAT') | grep -E "percentage" | awk '{print $2}' | sed 's/%//')

AC_POWER=$(cat /sys/class/power_supply/AC0/online)
if [ $AC_POWER -eq 1 ]; then
    exit
fi

if [ $BATTERY_LEVEL -le 5 ]; then
    notify-send "Low Battery" "Battery level is ${BATTERY_LEVEL}%" -u critical
    exit
fi

if [ $BATTERY_LEVEL -le 10 ]; then
    notify-send "Low Battery" "Battery level is ${BATTERY_LEVEL}%" -u normal
fi