Ok now I suddenly have a battery issue - didn't before. And I see that pulseaudio is using 16-18 % CPU, which must be the cause - it's constant. And I have not started the media player, or anything else that plays anything. So why is pulseaudio spending CPU?

If I plug in headphones it drops to 9-11%. There's no sound of course, because there's nothing playing! If I unplug the headphones the CPU goes back to 16-18% again. Something is wrong here.