Google is your friend...
Every EV owner should print up a card like one of these when publically charging:
https://www.google.ca/search?q=ev+charging+etiquette&client=ubuntu&espv=2&biw=1215&bih=689&source=lnms&tbm=isch&sa=X&ei=hockVZq1LPWTsQSB84DwAw&ved=0CAYQ_AUoAQ#tbm=isch&q=ev+charging+etiquette+unplug