It looks like it sleeps almost all the time. The battery level is down to 50% now after 12 hours of usage (not much usage) so there is not a massive drain but more than before.
mcetool --get-suspend-stats
systemctl stop hciattach.service
systemctl start hciattach.service Job for hciattach.service failed. See 'systemctl status hciattach.service' and 'journal ctl -xn' for details.