has anybody out there ran more than 16.8 volts to the evx-2? i am looking at running 2 9.6v batteries at it. any advice out there on this subject?. got tired of the 16.8 volts in the boat already. i know the traxxas xl5 can handle up to 9.6v and is posted to do so, but the evx2 does not say anything past 16.8 volts. thanks