Hello Henkjan!
One of my two Eve Room (2018) is connected to a charger 24/7 since two years. No problem, but no range extension of cause. Just keep in mind as for all of these batteries having it 24/7 attached, the battery life will decrease once you decide one day to use it without charger. Same applies to iPhones and other accessories. Best regards, Volker
Jan 18, 2021