I see there is an input voltage range of 3-17v. Does the input voltage carry through to the voltage supplied to the motors? Right now all I have is 4 x aa battery holder and I was wondering if I purchase something like 3c lipo at ~11v would that extra voltage get regulated down or would it carry through to the motors and allow them to spin faster. I looked thought he docs and did not see anything about the output voltage so I apologize if I missed it. Thanks!

Here is a handy class for people who want to program the moto:bit in micropython:

from microbit import *

class motobit:
    #8-bit index of the motobit functions (expressed in hex)
    left_motor = 0x21
    right_motor = 0x20
    motor_enable = 0x70
    invert_left = 0x12
    invert_right = 0x13

    #8-bit address of the motobit itself (expressed in hex)
    motobit_address = 0x59

    #method to combine an 8-bit index with an 8-bit command and send it to the motobit via i2c
    def write16bit(self, index, command):
        i2c.write(self.motobit_address,bytes([index, command]), repeat = False)

    #method to enable the motors, use motobit.enable(1) to enable motors
    def enable (self, run):
        self.write16bit(self.motor_enable, run)

    #method to run a single motor
    #power is in the range [-127,127] and will be clipped if too big
    def run_motor (self, motor, power):
        # add 128 to the power because the actual range of input is 0-255
        power+=128

        #now make sure power is in the range 0-255
        if power < 0: 
            power = 0
        elif power > 255:
            power = 255

        #send the command to drive the appropriate motor
        self.write16bit(motor, power)


    #method to drive both motors 
    def drive(self, left_speed, right_speed):
        self.run_motor(self.right_motor, right_speed)
        self.run_motor(self.left_motor, left_speed)

    #method to invert the left motor, use motobit.invert_left_motor(1) to enable, (0 to disable)
    def invert_left_motor(self, invert):
        self.write16bit(self.invert_left,invert)

    #method to invert the right motor, use motobit.invert_right_motor(1) to enable, (0 to disable)
    def invert_right_motor(self, invert):
        self.write16bit(self.invert_right,invert)