The contact owns a 2006 BMW 525xi. The contact stated while driving 50 MPH, the contact smelled the odor of burning coming from the vehicle, and the contact noticed smoke coming from the trunk of the vehicle. The contact pulled over and notice that smoking was coming from the battery. The contact was able to stop the smoke. The vehicle would not restart, and the vehicle was towed to the contact's home. The vehicle was not diagnosed. The vehicle was repaired. The manufacturer was not contacted. The failure mileage was 154,000.