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${color}Power: ${color}$acpiacadapter, ${color}Battery: ${battery_percent CMB1}% 
${if_existing /sys/class/power_supply/AC/online 0}
    ${if_match ${battery_percent CMB1} <= 10}
        ${if_match ${battery_percent CMB1} <= 5}
            ${if_match ${battery_percent CMB1} <= 3}
                ${color red}                
                ${exec shutdown -ahP -t 30 now"Shutting down 30 seconds; critical low battery!"}
            $else
                ${color red}
                ${execi 60 /usr/local/bin/criticalbat.py}
            $endif
        $else
            ${color orange}
            ${execi 120 /usr/local/bin/lowbat.py}
        $endif
    $endif
$endif${battery_bar 4,180 BAT1}

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$ cat /usr/local/bin/lowbat.py
#!/usr/bin/env python
import pynotify
pynotify.init("foo")
pynotify.Notification("Power warning","Battery capacity is low.","battery-low").show()

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$ cat /usr/local/bin/criticalbat.py
#!/usr/bin/env python
import pynotify
pynotify.init("foo")
pynotify.Notification("POWER WARNING!","Battery capacity is critically low!","battery-caution").show()

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$ /usr/local/bin/lowbat.py
Traceback (most recent call last):
  File"/usr/local/bin/lowbat.py", line 4, in <module>
    pynotify.Notification("Power warning","Battery capacity is low.","battery-low").show()
glib.GError: GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name org.freedesktop.Notifications was not provided by any .service files
dqualls@Little-Luddite:~
$ /usr/local/bin/criticalbat.py
Traceback (most recent call last):
  File"/usr/local/bin/criticalbat.py", line 4, in <module>
    pynotify.Notification("POWER WARNING!","Battery capacity is critically low!","battery-caution").show()
glib.GError: GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name org.freedesktop.Notifications was not provided by any .service files

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#!/bin/bash
yad --image="info" --text="the battery is critically low. Save your work and press OK to shutdown" --button="gtk-ok:0" --button="gtk-cancel:1"
ans="$?"
case $ans in
0)
    # shutdown 
    sudo shutdown -h now 
;;
1)
    #exit
    exit;
;;
esac

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#!/bin/bash
sudo -S < passwordfile &> dumpfile shutdown -hP 1"Shutting down in one minute; critical low battery!"