These are garbage devices. The Symfonisk sound controller isn’t bad, but it isn’t great either. The dimmer is just a piece of junk. There’s a reason IKEA gave up on them too!
I’ve had better luck with battery life on my Symfonisk Sound Controller by instead joining it to my ConBee 2 coordinator in HA. But, button devices (which is essentially what that is) joined to HA don’t have entities, so I wasn’t able to use it with Home Assistant Devices Bridge. So the easiest thing to do was to also connect my Symfonisk speaker to HA. I don’t use my Sonos for anything but music, so for me this worked out, but it’s not a solution that will work for everyone.
The problem is the Symfonisk Sound Controller drops off the HE Zigbee network and then it drains its battery searching for the host. So this has been an acceptable solution. I do think Hubitat’s Sonos integration is better than Home Assistant’s, but I really like that sound controller, despite its problems and low quality, so I’m willing to compromise with the shortcomings of the HA Sonos integration.
