need a longer run time, tried lipos when I first got the truck
and my esc fried :( not sure if it was the double lipo setup or something else, traxxas replaced the esc and it runs good with 2 nimh battery packs. running 1600 packs

I would check here and see what they are running.
http://monster.traxxas.com/forumdisplay.php?f=71