I learned something of interest thought I'd pass it on...
I took both my MVP2, my VV3, and my eVic - charged all three up, turned then off, and packed them away for 3 weeks (got my new ProVari just then).
Well, when I pulled them out the battery on the eVic was flat, not even enough juice to turn on. The MVP2 still showed 4.2v when powered up, and the VV3 showed 4.1v when powered up. What surprised me is that the eVic must still have some parasitic power loss (PPL) even when shut down in menu.
Three weeks isn't a huge test, but when you like to keep a backup in the glove-box of your car, this is rather nice to know.