A simple prompt when your battery is 10% there are probably better alternatives to this but if you'd like to use this feel free to do so.
Make sure you have python3 and pip3 installed, you can install pip3 via sudo apt install python3-pip and install acpi and xdotool via sudo apt install acpi xdotool
clone the repo via git clone https://github.com/MrPotatoBobx/battery-prompt
then run pip3 install PyGObject
after that you can run it via python3 ~/battery-prompt/battery-calculate.py
I reccomend running at the start of your desktop enviorment/ window manager session here i have linked guides to run commands at start on some desktop enviorments and window managers:
i3: https://www.reddit.com/r/archlinux/comments/2m4qni/autostart_programs_with_i3_upon_login/ (first comment)
xfce: https://superuser.com/questions/27854/starting-a-script-on-xfce-login-and-logout
kde: https://www.addictivetips.com/ubuntu-linux-tips/autostart-programs-on-kde-plasma-5/
gnome: https://help.ubuntu.com/stable/ubuntu-help/startup-applications.html.en