A. With teh front of the car facing YOU, which battery terminal should be in the left part of the thing you put the battery into (the holder or whatever). Positive or negative?
B. How the blaze do i fit this think into a body even with the pcb flipped? How do i flip it correctly?
With the car facing YOU, solder a wire to the negative end of the battery in the car. Solder the other end to the positive end of the second battery. Then solder a wire from the negative end of the 2nd battery and put the other end of that wire into the negative terminal of the car (Which is on your right, if the front of the car is facing you.) Put insulative material between the first battery's negative end and the wire touching the negative terminal, and that is your dual cell.
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