Keeping the battery off the cement goes back to the days when you had caps on the 6 cells. Remember how the clamps got the corrosion buildup? for the same reason, some of the acid fumes can get UNDER the battery, and eat up the concrete. So if you put it on a bock of wood, to elevate it, the acid fumes dissapate. Ventilation is a good idea too, but I would assume it's in your garage, which probably has fresh air occasionally. I keep my battery in the basement, on the bottom shelf, near the chargers. Probably doesn't matter at ALL now, with the sealed batteries. I've never experienced flat spots, and I store mine straight from Nov - April. Maybethe flat spots only happened to the old-style bias-ply tyres? thx