Linux Laptop shutting down on battery level bellow 8%

I've written an crontab entry that runs a script in my home directory as user. That notifies me if I forgot to switch the power brick on. This works fine.

BATTERY=$(upower -e | grep 'BAT')
BATTERY_PERCENTAGE=$(upower -i $BATTERY|grep percentage|awk '{ print $2 }'|sed s/'%'/''/g)
AC_STATUS=$(cat /sys/class/power_supply/AC/online)

echo "Battery: $BATTERY_PERCENTAGE %"


if [ "$BATTERY_PERCENTAGE" -lt "20" ]  && 
[     "$AC_STATUS" -eq "0"             ]; then

   notify-send --urgency=critical "WARNING: Battery is about to die"  "Plug in the power cable"
   mplayer samsung_low_battery_sound.mp4 &> /dev/null 

fi

My problem is that I don't want another root crontab entry, to check if the battery and AC is switched off, to automatically shutdown the laptop if it is on 5%. Rather would prefer to use the existing script. But the shutdown command needs root access. Is it possible to auto-shutdown as user via script? (The desktop allows this)

Will

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