batterynotif.sh

#!/bin/sh

# Using a PID file 

cd $(dirname $0)
PIDFILE=/tmp/$(basename $0 .sh).pid

if [ -f $PIDFILE ]; then
  if [ -e /proc/$(cat $PIDFILE) ]; then
    exit 0
  fi
fi
echo $BASHPID > $PIDFILE

# Making a function for each Notification type 

notify_me_full () {
	notify-send -u critical -t 0 -i "$PWD/icons/battery-full-charging.svg" "$1" "Level : $2%"
	paplay /usr/share/sounds/freedesktop/stereo/alarm-clock-elapsed.oga
}

notify_me_low () {
        notify-send -u critical -t 0 -i "$PWD/icons/battery-low.svg" "$1" "Level : $2%"
        paplay /usr/share/sounds/freedesktop/stereo/alarm-clock-elapsed.oga
}


while true
do
    export DISPLAY=:0.0
    battery_percent=$(cat /sys/class/power_supply/BAT0/capacity)
    if on_ac_power; then
        if [ $battery_percent -gt 96 ]; then
		notify_me_full "You can unplug the charger now! the battery is almost full" $battery_percent
        fi
    elif [ $battery_percent -lt 20 ]; then
	notify_me_low "Plug the charger. Battery level is low, and that's not good" $battery_percent
    fi
    sleep 240 # 4 minutes
done