for your climate your going to want to stick with a correctly sized battery. I don't have any experience with this, but a smaller battery obviously has less strength. It can power the car, but not much else. If you run a stereo system or have a lot of extra accesories, etc. you're going to really tax that tiny battery. When its cold, cars never really like to start, they require more cranking amps. a smaller battery will not be able to provide as much current as a larger battery.
Oddly, I'm in an Electronics tech program, and we havent gone over batteries at all...i should bring that up
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