Next time, on a hottest day in the year, put your hand on the roof of your car, after 5 minutes your hand will be cooked like an overdone steak. Combine this w

Next time, on a hottest day in the year, put your hand on the roof of your car, after 5 minutes your hand will be cooked like an overdone steak. Combine this with the fact that the driver may be racing to work on the hottest day, while running the AC on full. And 150F is something that happens to the battery every day for a month in many parts of America. And the battery has to handle spike temperatures up to 200F. Racing the car up a hill in the Southern texas sun? The Internal combustion engine can take it no problem because it's made of metal and plastics that can survive 200F. The battery maybe not.