Need some advise

[Sanotter]

not sure which forum to put it in,but i was wondering a rough speed average on a tamiya durga with 6.5t brushless and 11.1v 90c 4600mah lipo? if that would blow up then a 2c 7.4v 6400mah instead, and stock everything (ratio's and spur and gear etc..)

seeing as the 11.1volt would destroy my car, i was wondering on a battery that is affordbleish yet could run the car for around 40 mins? thanks.