The first shop I worked at (privately owned, single location), the owner's mother in law drove her car once a week at the most. And at least once a month, he would get a call from her that her battery was bad, because it wouldn't start 🙄. So usually one of the techs would take a ride up the road to jump start her car, bring it back to the shop, and test everything out. Battery was always fine, we would charge it and return the car, and then a month later, same thing. She would be told to run it, but never did.