batterie capacity question

thank you to all guys, your reply is very appreciated, but i don't know what to do. My MBX5T is pretty heavy, i run Badland on it because the track where i run is very loose, and this tire is heavy. I use nechanical brake, and my truggy is near to 11.5 lbs with a 5000mAh, 4s pack.
So i don't want to run twin pack on it.
I think that if i choose a Flightpower 3700mAh, 25C, 6s, it would be enough for a 6-7 min race?

[Patrick]

Originally Posted by david lamontagn

I think that if i choose a Flightpower 3700mAh, 25C, 6s, it would be enough for a 6-7 min race?

I think you should get 12-15 minutes, depending on all the usual stuff.