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Makes me wonder the same thing. At the very least, next winter we should insulate the batteries with foam board. The batteries heat up when charging & discharging, and that'll help hold some of it in.
Of course I knew all about this before winter set in. But I'm one of these people who can read about it and get all kinds of advice, none of which I'll take until after I experience it myself. Doh!
The guy who donated the batteries to us drives his converted Ranger EV pickup year round in Ottawa, and he has insulated battery boxes with thermostatically controlled heating pads.
The problem - you saw it too - is that if you're not using the vehicle regularly, it's harder to do this (and have it be worthwhile from an energy use angle). And the car doesn't get used every day, normally.
Still: fun, fun. The rolling science experiment rolls on.
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