Watch batteries will essentially erode a child's esophogus if swallowed and stuck through a chemical reaction that dissolves tissue. This kills the child. It's

Watch batteries will essentially erode a child's esophogus if swallowed and stuck through a chemical reaction that dissolves tissue. This kills the child. It's common to see watch batteries coated with a substance like this to dissuade toddlers from putting the watch battery in their mouth. https://www.youtube.com/watch?v=q5ApVlDCEjc https://www.youtube.com/watch?v=q5ApVlDCEjc