I am curious about the performance of these vehicles. No, I'm not expecting them to be an Indy race car, but how well do they do on acceleration, steep hills, etc? How well do the batteries do in extreme cold? If you don't run the car for a day or two and the temperature is in the teens, do the batteries get sluggish? Are the batteries good for the life of the car? How expensive is it to replace them? Also, how good is the air conditioning in one of these cars? Anyone who has any real-life experience with these cars, please let me know. The websites for the car companies are a bit biased.