Battery RUn times

[nbcaznmaster]

Well, since i really wnat a e-revo, i might as well race it. problem with the unlimied class is that they have 45-minute a-mains. How u suppose to keep up if you have to change your batts ever 10 minutes? How long of runs could u get with lipo batts? What would be a good mah. How would u know if they are about to die if its always constant (dont want it to die in middle of track).