It's 35* in my garage now. I run 2 Schumacher battery tenders on both of my cycles. I always leave them on the concrete floor or a metal stand when charging batteries.
Some guys will tell ya no floor. But batteries are not made like when it was a no-no anymore 35 wow. That's real Pen-E-Guin weather. My wife won't go outside in them temps. Supossed to get down to 69-68.
