VIDEO: Firefighters are warning parents after a Cocomelon children’s book caused a minivan fire in North Carolina. The George Hildebran Fire & Rescue Department said Sunday that a child’s car seat caught fire soon after the child had gotten out. After the flames were put out, the Fire Marshal’s Office determined that the fire was started by a “button battery” inside a children’s book that was left underneath the seat. Photos of the fire damage showed the padding of the car seat burned, along with some of the plastic melted. The fire department shared a photo of the book they believe caused the fire. It is a Cocomelon book titled “JJ’s Potty Time” that makes sounds. While firefighters did not specifically say what type of battery was involved, most button batteries are made with lithium.