my crazy mad scientist friend came up with a pretty good idea last night. he wants to install a doublethow double pole switch into the battery circuit.
we couldnt find one small enough in his shop to do this last night tho.
he says it will have many benefits. first of all you will be able to switch between a series and parallel circuit for your batteries. in parallel you would be able to charge with a normal controller then switch the circuit back to series and have that power again.
also you would be able to turn the car "off" when not in use so the batteries dont drain overnight.
the hard part of this mod will be finding a switch small enough.