SEEED MotorShield V2.0 Output Load Voltage for a Specified External LiPO Battery Input Voltage

I have learned enough basic information related to Arduino programming to be less than dangerous.

I have a question related to the use of the SEEED Motorshield v2.0

Specifically I want to drive the V2.0 shield with an external 4-cell nano-tech LiPO, 1.8 AH battery. The battery output voltage is 14.8 volts. When I apply this battery voltage to the V2.0 Shield, what output voltage will be delivered to my small DC motors when driven with the shield?