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read somewhere that the s-class has a self-leveling mechanism that continues to function even when parked with the motor off. if you park in a windy area and your car is continually jostled by the wind, that mechanism keeps compensating and uses up power. also, practically all functions of the s-class (w220) is powered by the battery (self-closing doors, adjustable chassis height, memory settings on all seats, parking sensors, even the headrests, etc). the s-class comes equipped with an oversized battery but i guess, its reserves get used up pretty quickly just the same. also, try topping up your battery water every 6 to 9 months - even if it's supposed to be a sealed battery. you can access the cells by using a large coin to unscrew the covers. that alone should extend your battery life by at least a year or two. rols

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Q: Why does the Mercedes s class battery go flat?
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