The contact owns a 2014 Ford C-MAX. The contact stated while driving at approximately 20 MPH with all four windows closed, there was a strong abnormal odor coming from the rear of the vehicle. The contact then opened all the windows allowing the odor to release, and the abnormal odor was not as potent. The contact later inspected the vehicle and discovered that the original Volvo battery could be emitting a toxic substance that was entering the vehicle; the battery was original equipment. The contact sustained dizziness and difficulty breathing. Medical attention was not sought. This occurred on several different occasions. No warning light was illuminated. The vehicle was drivable and was taken to the place of residence. A dealer was not contacted. The vehicle was not diagnosed or repaired. The manufacturer was not notified of the failure. The failure mileage was approximately 131,500.