[audunw]

If you take into account fusion then the energy density of water is insanely high. Doesn’t mean you need to worry about it.

It’s a myth that energy density is a reason to worry about batteries or any other form of energy storage. How much energy is stored doesn’t say anything about how easy it is to release that energy in an uncontrolled way.

For Li-ion batteries it’s not really the electric energy stored you need to worry about at all. It’s the flammable electrolyte.

Solid state batteries are often very safe since they usually don’t have a flammable electrolyte. And when the electrolyte doesn’t burn it’s much harder to get a short and thermal runaway as well