Recent Battery Unavailable Notification

I've been trying to workout what has suddenly started to send me notifications about Battery Alert. This isn't something I've added. I have my own battery monitor automations etc setup and I'm also using custom:battery-state-card which works well. But recently I added a Smart Water System from Third Reality hooked up through Z2M. The monitor itself is powered by USB so batteries not in use anyway. The alert is not from the battery-state-card and indeed, this device is excluded from it. So I cannot workout where this notification comes from as I want to supress them. Any help would be much appriciated!

This is introduced in latest update. Not sure where to find it (yet)

Thanks, yes - I wondered if it was related. I'm hoping there's a way to supress these!