If someone wanted to prevent this, how would one do so? By remplacing the 12v battery?The first step is to charge, or jump from another car's battery in the conventional way, the 12V battery. It's behind the passenger side footwell and a foam block that contains the tire inflator/sealant kit. Even if the charge door wasn't locked, the high voltage battery cannot be charged until the 12V battery is charged. Unfortunately, due to a software design flaw, a failing 12V battery can cause the HV battery to self-destruct (the battery management module discharges the cells to zero) which effectively renders the Smart a brick if it is no longer under warranty. Maybe, jsut maybe, you will be lucky. Charge or jump the 12V battery right away!
The international hacker community has developed methods to restore Smarts that have been bricked in this way - but that is a topic for later.
My car is not in storage. But the 12v has never been changed. I just don't want to wake up one day a have a brick.