How can I get notification when my laptop battery gets fully charged?

I have written a small script that will do that:

Script:

#!/usr/bin/env bash
while true
do
    export DISPLAY=:0.0
    battery_percent=$(acpi -b | grep -P -o '[0-9]+(?=%)')
    if on_ac_power; then
        if [ "$battery_percent" -gt 95 ]; then
            notify-send -i "$PWD/batteryfull.png" "Battery full." "Level: ${battery_percent}% "
        fi
    fi
    sleep 300 # (5 minutes)
done

Installation:

Run:

sudo apt-get install acpi
git clone https://github.com/hg8/battery-full-notification.git
cd battery-full-notification/
chmod +x batteryfull.sh

Copy the script to ~/bin folder (why the ~/bin folder?) :

cp batteryfull.* ~/bin

Or copy it to /usr/local/bin if you want it to be available for all users on your computer:

cp batteryfull.* /usr/local/bin

Then add batteryfull.sh script as a startup application by:

• Open Dash
• Search for Startup Applications
• Double-click the icon

• Click Add and fill in as follows:

  

Install the acpi package. Now put this in return0whencharging.sh and make it executable:

#!/bin/sh
acpi -V
if cat /proc/acpi/battery/BAT1/state | grep "charging state" | grep -vE ":[\t ]*charging$"; then
    exit 1
else
    exit 0
fi

If echo -e "\a" makes a sound, start this when you want to watch the battery status:

watch --beep return0whencharging.sh

If it doesn't make any sound or you want a notification and a better alarm than whatever watch can provide, install libnotify-bin and mpv and use this instead:

while return0whencharging.sh; do sleep 1; done; notify-send "Finished charging" && mpv -loop /usr/share/sounds/freedesktop/stereo/alarm-clock-elapsed.oga

Explanation:

If you look at the man page for grep you can see that -v reverses the matching, and therefore the return/status code. -E means it's a regular expression. the [\t ] in the regex (regular expression) means "tab or space". The following star makes it mean "tab or space 0 or more times". The trailing "$" means that it should match the end of the line. The final grep means that lines NOT ending in a ":", any number of tabs or spaces and then "charging" and the end of the line should make grep exit with status code 0. This means that grep will return 1 as long as the computer is charging. The if will execute it's first branch when the status code is 0, which means we are effectively negating the result of grep, since we exit 1 when grep exits 0 and exit 0 when grep exists non-zero.