Yeh, you just learned one of the reasons why this is the single most important upgrade for an RTR buggy. For reference and so you can advise friends, etc, it's always a good idea to zip tie the 4 AA batts in their holder, if you don't have a proper receiver pack.

Also, a simple throttle return spring would have averted the disaster (you can adapt a spring from a ballpoint pen to do this), just find a suitable point to attach it to. For your info, most tracks REQUIRE you to have a throttle return spring or they won't let you run.

Glad you're enjoying the car, good luck with it!!