I can't believe people are all in on the electric car thing. I currently live in AZ. The plain ole battery in my gas car has to be replaced frequently from the heat - usually free because it's always under warrantee when it dies. When I lived in VT, I rode a 125cc scooter as my main form of transportation and gave up even trying to keep the battery alive in it, I'd just kick start it.
Batteries don't like extremes in temperatures. I'm assuming it's because the chemicals used don't like extremes. Most stuff you buy will say "store in a cool, dry place" and you can't exactly do that easily with a vehicle you actually need to use.
I remember my mom used to own one of those cars with the four interlocking circles as their logo. it was slightly fancy but very old, and we moved to AZ, shortly after the car died haha, all the electric melted and it was just about useless.
In conventional batteries it's the lead plates inside that overheat.
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