Originally Posted by old_dude

One of the biggest issues running this esc without a booster is the loss of servo speed. If you are running a road course your servo is only running on battery voltage. With a booster it will run at 5 or 6 volts depending on the model/brand. That is also why the amp rating of the booster is important. On another note, the older/larger AMB transponders need 5v to operate reliably. You don't want to miss being counted.