Battery and ESC help
 

I run a EVX with one battery and 9 tooth pinions in my clod and it seems to work fine. But curiousity is getting to me would it be better to go ahead and run two batteries, and would my run times change. Any help you guys can give me would be greatly appreciated.

Your run time would not be affected either way. You will just be putting more twice the voltage to the motors making twice the current in amps. You will have double cabacity with two batteries, but the current draw will also double.
Basically you just run your motors at a higher power. Make sure they can handle the 14.4 volts.