charge-battery.sh

#!/bin/bash
MIN_CHARGE_LEVEL=${1:-40}
MAX_CHARGE_LEVEL=${2:-60}
while true
do
    battery_level=`cat /sys/class/power_supply/BAT0/capacity`
    if [ ! $battery_level ]; then
      echo 'No battery found'
      exit
    else
      status=`cat /sys/class/power_supply/BAT0/status`
      if [ $status == "Charging" ] && [ $battery_level -ge $MIN_CHARGE_LEVEL ]; then
        notify-send "Battery above ${MIN_CHARGE_LEVEL}%" "Charging: ${battery_level}%"
      elif [ $status != "Charging" ] && [ $battery_level -le $MAX_CHARGE_LEVEL ]; then
        notify-send "Laptop UNPLUGGED" "Charge: ${battery_level}%"
      fi
    fi

    sleep 60 # seconds
done