II asked about the being brushless and having a nimh battery because I had a similiar issue last year with an rc. I got an Exceed RCRally Monster, the brushless edition, which also shipped with an included nimh battery. I charged it once the truck was unboxed. I then took it for a test run and it did the same. I later found out that the truck (esc) was pre-programmed for lipo mode)
Hope this helps, perhaps nitrosportsandrunner
can help you with programming the esc if thats the case.