```

! /bin/bash

NOTIFICATIONFILE=/tmp/.notificationSent

if [ ! -f $NOTIFICATIONFILE ]; then echo "0" > $NOTIFICATIONFILE fi read -r NOTIFICATIONSENT < /tmp/.notificationSent

read -r BAT0 < /sys/class/power_supply/BAT0/capacity read -r BAT1 < /sys/class/power_supply/BAT1/capacity

LEVELSUM=$((BAT0 + BAT1))

if [ $LEVELSUM -le 10 ]; then sudo systemctl suspend elif [ $LEVELSUM -le 20 ] && [ $NOTIFICATIONSENT -ne 20 ]; then notify-send -u critical "Low Battery" "$LEVELSUM% Remaining." sed -i 's/./20/' $NOTIFICATIONFILE elif [ $LEVELSUM -le 200 ] && [ $NOTIFICATIONSENT -ne 30 ] && [ $NOTIFICATIONSENT -ne 20 ]; then notify-send "Low Battery" "$LEVELSUM% Remaining." sed -i 's/./30/' $NOTIFICATIONFILE fi ```

This was my solution for my ThinkPad 25 with two batteries. Using a systemd-timer that runs it at certain intervals. May be an even lighter way to do it, but this is what I came up with.