I have a 2013 electric smart car that developed a very strange (bad ) odor. I can smell it (and my smeller doesn't work very well). Car was closed up and water vapor was on the windows (in other words damp inside). Battery had gone down from about 50% to 18% (I hadn't driven it in a few day but still should not have gone down that much!!) Light on gear shifter was on (showed it in park) which was odd. Looked all around inside and could see nothing amiss). Any idea. BTW my wife (who nose works well) said it smell to her like mold? Car is garaged in Phoenix, AZ so humidity is generally very low. Just check 12v battery and it is warm and smell seems to be coming from that area.