Originally Posted by
nzwasp
The freezing cold is really bad for batteries. I had a couple of brand new AGM batteries that I stored outside all last year (inside my trailer) and they both went bad. This year I have taken the one battery from my new trailer and stored it inside. I think also if you store it in your basement you should elevate it off the concrete floor. And keep it on trickle charge/maintainer if possible - I havent yet started doing this as it was fully charged when I brought it inside.
You won't hit the temps required to freeze a fully charged battery, less charge means the freeze point is warmer and that's when issues happen. Unless you have a drain on it, you don't need to trickle charge it over the winter in your basement. They can also be stored on concrete, modern batteries aren't porous and won't absorb moisture.
I do pull my batteries even though I have solar, the snow cover on the roof will eventually block the panels and with the draw from the fridge and stereo, they will eventually discharge.
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