I have a small area on my desk for batteries of various sizes, including these 9-volt batteries. I came home one day last week to see one of them popped its lid… I’m not sure why. There was nothing across the terminals or nearby that would short it out. I’m not sure if it slowly rose out of its casing like a growing flower but I’m glad that if it was violent at all that it wasn’t harmful to anything around it.
I had to share because it’s not something you see every day!