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I think operating temperature is important, so I'd imagine outside or garage is a no go? (My garage gets down to 40F at night, not sure if that's typical).

But maybe with enough insulation you could put it anywhere?

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Tesla cars are popular in northern European countries and I imagine these will work along the same lines: active heating of the battery. In the cars the capacity sacrifice is minimal and I imagine stationary batteries will be even better as (like you say) you can wrap them in a ton of insulation without having to worry too much about bulk and weight.

Well, depends on location ... I think mine was down around -10F last night and I don't have room for one in a heated space.

I suspect it will be a while longer before battery technology is as useful above the 49th parallel.

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