This is a read-only archive of the old Madabout Kitcars forum. New posts and replies are no longer possible, but every thread is still here to browse and read.
If you are really up for it you could do what the banger boys do and run the starter (only) on 24 volt, that makes it wing a bit.
The motor will operate happily on 24 volt; they will fail sooner than if operated on 12 volts but we are talking about running over a race season without failure.
The second battery can be just a small race NiCad but you will need some fancy relay arrangement to charge it but is a fast fix.