Well, the battery powers everything that isn't powered by the shore power. If it's dead, you won't get anything. I disconnect one side of mine because all the detectors will run it completely down in a couple of days. It's not good for abattery to sit drained. As to your original question, I lift mine off to see how heavy they are.
J & D in Lovely Weatherford, TX
2016 Jayco White Hawk 28DSBH TT
2014 Ram 2500 Crew Cab 4X4 6.7L Cummins