Tres Terra Europa battery question

Can someone tell me if the 36 volt lithium battery pack in my Tres Terra Europa has some type of load protecting breaker? My battery fully charged reads 41.2 volts, and the wheel will spin very fast on the stand, no load. When I throttle it while attempting to ride it, all power goes away, until I switch the battery off, then back on. And by the way, I only weigh 170 pounds. Thanks for your help.