We have had the dead battery issue as well. What worked (most of the time) was to TURN OFF the climate control, TURN OFF the radio. If we've somehow turned off the car when the AC was still on, the car would be dead when we returned to it. A handy item to have is the quick chargers sold at Costco. It's a pre-charged box with a couple of jumper cables. Hook one up to the battery under the hood and the other to a ground, jump into the car, hit the start button, and off you go. They run about $70 and it's a life saver. We've towed the car behind the motor home, and the car's been dead when we get to our destination. Pop the charger on, and poof! the car starts!. I hope this helps some of you.
