Mod ♥ 450/451/453 + Motos
Join Date: Sep 2008
Location: IL-WI Border
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I have two garage queen smarts that don't move during winter. I just inflate their tyres to slightly above normal pressure (but still under max). I haven't had any issues doing it this way. No flat spots, no cracking, and no suspension sag.
I don't own an ED, so I can't say what you should do with the HV. That said, apparently if the 12V battery is dead or removed for long enough, the HV may brick itself. So leave the 12V connected to the car and put a tender on it.