Eveready has a few batteries (Stuck) in research. I worked on not only Nuclear (yes Nuclear) and also newer lithium types.
BUT,
They are afraid of the stupid humans they would be selling to.
You know, the first one to loose a hand in an explosion would sue the piss out of them.
Normally if you would do something to them, they would go into overload and over heat, but on that rare occasion, one would explode like a real large firecracker, like an M1000.

(Lithium and water dont play nice, the machines we worked on were tested with hand granades, and run in a climate controled buildings to eliminate all humidity)
The others, have their problems to, but mostly if eaten, or punctured.
I am not kidding on this, I helped design parts of and build some of the machines that make them. The nicest part i helped design, tested for ones over heating, and right away would discharge them into a special oil bath to cool them .
BUT,
They are afraid of the stupid humans they would be selling to.
You know, the first one to loose a hand in an explosion would sue the piss out of them.
Normally if you would do something to them, they would go into overload and over heat, but on that rare occasion, one would explode like a real large firecracker, like an M1000.
(Lithium and water dont play nice, the machines we worked on were tested with hand granades, and run in a climate controled buildings to eliminate all humidity)
The others, have their problems to, but mostly if eaten, or punctured.
I am not kidding on this, I helped design parts of and build some of the machines that make them. The nicest part i helped design, tested for ones over heating, and right away would discharge them into a special oil bath to cool them .