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Letting a smart sit with a dead 12v battery can permanently damage the high voltage traction battery. (A clear design defect.) I would suggest you get it to a Mercedes dealer for diagnosis. Some users have reported quotes of up to $17k for repairs, effectively totaling the car. As Zinzer mentioned, you can find DIY repair attempts in this forum, but it is truly not for the faint of heart and doesn’t always succeed.
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