Going from a three cell to a two cell is going to cause the vehicle to slow down because you are dropping the voltage to the motor. The electronic speed control (ESC) has a built in voltage regulator that lowers the voltage being sent to the radio receiver/servos. External BEC's are also available that do the same thing. The number of cells determines the voltage of the battery. The mah determines storage or how long the batter will run before loosing power. The C rate determines how fast/efficiantly a battery can dump electricity.
Going from a three cell to a two cell will cause your vehicle to run slower because you are reducing the voltage to the motor. The number of cells determines the voltage. Your vehicle probably has an electronic speed control (ESC) that regulates the voltage that is sent to the motor and radio receiver/servos. There are also external voltage regulators called BEC. The mah determines storage power for a batter or how long it will run before loosing power. The C rate determines efficiency or how fast a battery can release it's electricity.
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