auto shutdown on low battery

alert-lowbat.sh

#!/bin/sh

threshold=10  # threshold percentage to trigger alert

while :; do
    capacity=$(cat /sys/class/power_supply/BAT1/capacity)

	  # If battery is discharging with capacity below threshold
	  if [ "${capacity}" -lt ${threshold} ];then
	    # Send a notification that appears for 300000 ms (5 min)
	    notify-send -t 300000 "Charge your battery!"
	    break
    else
		sleep 1m
	  fi
done

# the script are modified version of this article https://ejmastnak.com/tutorials/arch/battery-alert/

turn-off-on-lowbat.sh

#!/bin/sh

while :; do
        batt=`cat /sys/class/power_supply/BAT0/capacity`
        if [[ $batt -le 10 ]]; then
                shutdown now
        fi
        sleep 1m
done

I wonder how to use other notification UI, says Telegram? so maybe I don't need to install additional package and use the telegram notification instead? is that even possible?

I see the telegram service on /usr/share/dbus-1/services/

it seems interesting to run the program on startup, maybe I need to mess up with systemd? haven't tried it before.

and watching the state of battery (charging or discharging) to resume/respawn the program on discharge, and exit/suspend/stop the program on charging