That is just "BS" I have had at least three batteris replaced at my home or place of business. It is always at the price of a over the counter battery, my service advisor told me not to come in because then they charge labor. This is not the first time I have heard of them playing this game of "at night, too far", and attempting to charge. I have also heard of them marking up the list price. I would call 1-800-FORMERCEDES, and complain, I hope you did not call the dealer direct!