Right, all things being equal and relative. Which they are not in, oh, say, upper state New York in February. Seriously, you don't have to be a genius to figure this out. Does Tesla really have to 'qualify' that statement for the masses? The Model S battery will not lose a significant amount of charge when parked for long periods of time - except when the temperature dips below freezing, and then you can expect the batteries to behave like all other batteries of the same type in cold temperatures, and exponentially as the temperature drops lower blah, blah, blah... Apparently the answer for some is: h e double hockey sticks, yes.