To simplify the logic behind my circuit: 'on' phase connects battery with the RX-18, while the charger connector is outside the circle. In the 'off'´ position connector for the charger is connected to a battery, but at the same time positive and negative poles of the RX-18 are connected, so that capacitors on the RX-18 can empty . 
Discharging capacitor switching option enables RC tank / car / airplane to be without initial jerks for electronics and suddenly unwanted wheel spin when RC car is turned on (in ´stand by´ state).

So this can be seen as extra safe precaution.

And yes, I´m complicated dude!!!