Hi @lschip,
I just tested a rule which is working fine also without a change of the when part of the rule “when lowBattery”. But the gui suggests the rule to be like this
when
lowBattery of fenster-wohnzimmer is equal to ok and fenster-wohnzimmer is opened
or
when
lowBattery of fenster-wohnzimmer is equal to low and fenster-wohnzimmer is opened
or
when
lowBattery of fenster-wohnzimmer = low ...