Battery Question

I keep my spares out in the unheated shop through the winter. Check them about once a month but they usually are fine. What I don't do is let them sit on anything like a concrete floor. They sit up on a wooden bench. It's not really required anymore to keep them off the concrete to keep them from discharging but that's what my dad taught me and old habits die hard. The only reasons I keep them on a bench now is the concrete gets pretty cold and stays that way but the shop air at the bench level seldom gets that cold and for most of the winter (except for this year) stays just above freezing. They are also easier to check at bench level.