I just bought a used losi micro desert truck and was told to get a lipo battery to go faster and get longer run times. The package says no modifications needed. So I got a 300mah 2s 7.4v lipo and charger. After charging the battery I placed it in the car and it fit perfect. When I went to go drive the car however it ran for about 10 seconds then just stopped but the front wheels still have steering and will move, it will just not go forward or reverse. If I turn the car off and turn it on a second later it dose the same thing runs for about 10 seconds then dies. I replace bearing with ball bearings and a threaded axle kit I was told on another site it may help but no luck. Please help if you know anything about this problem or what it could be. I apologize if I posted in the wrong area wasn't to sure where to post