What happens when all the billions of tiny lithium batteries that are spread across the world are 20, 30, 50 years old? Are they essentially billions of tiny f

What happens when all the billions of tiny lithium batteries that are spread across the world are 20, 30, 50 years old? Are they essentially billions of tiny firestarters waiting to go off? https://www.bbc.com/news/science-environment-63809620 https://www.bbc.com/news/science-environment-63809620