The battery level of my Bluetooth headphones was not displayed by default. To correct this, a simple change is all that is needed:

Adjust configuration file

In the file /etc/bluetooth/main.conf, an

must be inserted in the section “[General]“. You can then restart either the entire computer or only the Bluetooth service with

and the battery status is displayed in the settings under “Energy”, for example:

Ubuntu zeigt in den Einstellungen Akkustand an

Show battery status in the top bar

So that I don’t have to take the diversions via the settings, I display the battery status of the headphones directly in the top bar next to the time. I use the following Gnome extension for this:

https://extensions.gnome.org/extension/5615/battery-indicator-upower/

Akkustand von Bluetooth Kopfhörer in Ubuntu