The battery no longer works but I’ve kept it plugged in and used it for streaming music at work the last few years. Today it’s in an infinite loop of rebooting and I noticed the glass popped out!
That’s better. Ideally move them into a bucket or more of sand. I don’t know how it would work for batteries, but explosives get more dangerous when put in a container. Sand is better because it can absorb a lot of thermal energy without catching fire. Any non conductive non flammable material like that should work.
Also I’m not an expert on this stuff. Go find and listen to one.