It's a symptom of our modern ignorant educations that people don't know simple chemical facts. Charging and discharging a battery depends on chemical reactions. The speed of chemical reactions depends on temperature. The rule of thumb is that chemical reactions happen two times faster (or slower) for every 10 degrees Celsius difference.<p>So if the temperature is 20 degrees different the speed of the reaction will be (20/10 * 2) or 4 times different. For 30 degrees difference it will be 8 (2 x 2 x 2) times in difference.<p>So if it takes 2 hours to charge your car at 20 degrees C, it will take 8 hours to charge your car at 0 degrees C. And your range will probably drop to about a quarter, pretty much.