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well...i think that in a 2 speed BCG with "booster function" the current is pulsed to the motor instead of being stepped down through a resistor. So in reality the motor is only on for half the time. When the boost button is pressed, then full current is supplied to the motor so you're only limited to how many batteries you can cram into a chassie. There are also mods for an anti-boost function, where instead of using the boost button for speed, it is used for half speed. In that setup the car will then run at full speed until the button is pressed.
Try the Bit Science Section of this forum for more info
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