Well, I have 15kwh of batteries in a shed (powering my internet connection and this computer, actually). The are mostly in a shed for convenience- I'm not too worried about a fire, personally.
You can charge them when freezing, but you can discharge them while freezing.
Discharging them causes their internal temperature to rise.
Last winter (I'm in the desert in CO at about 6k feet, with temps in the single digits at some points) my graphs say that they never failed to reach 40-something degrees and charge.
Maybe there are other issues I don't know about, but I certainly hope they work as well this winter as they did last winter.
You can charge them when freezing, but you can discharge them while freezing.
Discharging them causes their internal temperature to rise.
Last winter (I'm in the desert in CO at about 6k feet, with temps in the single digits at some points) my graphs say that they never failed to reach 40-something degrees and charge.
Maybe there are other issues I don't know about, but I certainly hope they work as well this winter as they did last winter.