Maybe where you live, but where I live the temperature outside is bad for batteries.
Though what is "inside" is debatable. My car can sit outside because it has the batteries in a case that is climate controlled when needed, and so the batteries count as inside even though they are in a car that is outside.
Though what is "inside" is debatable. My car can sit outside because it has the batteries in a case that is climate controlled when needed, and so the batteries count as inside even though they are in a car that is outside.