A Gnome Shell Extension for Ubuntu 22.04 that displays the battery level of your wireless mouse and /or keyboard in your upper panel; Battery Indicator (upower). You can get it by visiting https://extensions.gnome.org with the Chrome Browser then clicking on the “Click here to install browser extension” link. Once installed, you can search for Battery Indicator (upower) at https://extensions.gnome.org and simply turn it on for your system.
If you do not want the Chrome Browser extension or don't use Chrome Browser you can open Ubuntu Software Center and search for the Extension Manager tool. Install the Extension Manager App on your Ubuntu 22.04 system and use it to search for and install Battery Indicator (upower).
Once installed and running, you will see your mouse and/or keyboard battery level on your upper panel.
