KDE: bluetooth headset battery percentage

 If you like mine, I can't view my headset's battery percentage in my KDE's bluetooth notification.

To be able to see it, I need to add a line as below to /etc/bluetooth/main.conf under [General] section:

Experimental = true

Then you need to restart bluetooth service thusly:

systemctl restart bluetooth

You can see the percentage as screenshot below:

If you still can't see the percentage, it may mean your device or driver does not support it. 

That's all there is to it