Doubling from nearly nothing to next to nearly nothing is not really an advancement. Get to me when they manage to pack in 33 MJ/L, like gasoline.
If they doubled the energy of lithium, they would move from
2 MJ/L to 4 MJ/L.
https://en.wikipedia.org/wiki/Energy_density#/media/File:Energy_density.svg
It is a dead-end path at the moment.
” Get to me when they manage to pack in 33 MJ/L, like gasoline.”
But most of that energy goes up in smoke and hear. Then you have to factor in the weights of the motors and accessories.

Would enough batteries in the sky exploding cause an EMP?