My car is on its fourth auxillary battery at 13,000 miles. The dealer says my batteries keep failing because I don't drive my car enough to keep it charged (10 to 15 miles every two days). I find this excuse to be ridiculous. If we have to drive our cars every day to keep the battery from dying, then how do we go on a two-week business trip or vacation? If the dealer is correct, wouldn't that mean the dealer has to drive every single hybrid car on his lot every single day before he sells it? And that would mean that every single hybrid car would already have several miles on the odometer at the time its sold as new? I suspect my car is a lemon and my dealer is acting like a used-car salesman. What do you think? Please contact me and let me know about your experiences with your auxillary battery and what you think about my dealer's reasoning. Thanks.