first you must discharge the battery. to discharge the batteries you can just pick up the car, push the throttle until the wheels stop spinning and then STOP! otherwise you can over discharge your batteries, and that's as bad as over charging.
and when charging your batts, they must not heat up.
that's just what I know, I hope I'm right, anybody disagree?

looks like jkljkl6 has the "new" Mini, pretty nice!