Unusual electrical actuator type noise after sitting

My Sport First Edition has been sitting for three days in my garage. The key is inside the house away from the vehicle. I hear what sounds like some type of actuator noise. Another forum suggests it is the headlights preventing moisture build up for the LEDs. With the Bronco making noises just sitting and a long time after being started, how long will the battery last if left sitting for an extended period of time? Not to mention that Ford should make owners aware to prevent being overwhelmed with return trips to the dealer and a waste of time. If anyone has info, please share.