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you can omit all the diodes if you are only planning to run two cells as when put in reverse all that happens is that 1.5v is put to the 1.5v of the other cell as there is not potential difference no curent will flow if there is one will charge up the other.
but if you want to run more than two extra cells then there will be a potential difference when the car is put in reverse and the.
the qustion is when the car is in idle does the cars controll circuitry leave the circuit closed or open as if it is closed the extra batter will cause the motor to continue to spin and not stop.
in the long run it may be worth just wireing the two batterys to the pcb board and replacing any burnt out components if they blow.
does anyone know what parts the fets are and if they can be replaced with heavier duty ones
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