Hackster

I am curious if an occasional (once a month?) gentle pull on a parking brake, while approaching a stop sign (with button pressed, of course) is all that's required to clean the rust off the rear rotors?

You would think so, but no - I left it plugged in all night. The design apparantly relies on that 12 volt battery being charged to even be able to charge the car at all. 

Right, silly me - once the 12V battery is dead, the car will not communicate with the charger and will not start charging. 

If it's an Energi, couldn't you have simply plugged it in the wall outlet?