Or car batteries. EVs are still heavier than ICE vehicles and road wear goes up by what was it, the 4th power of axle weight? Even at the exact same capacity per volume, an increased capacity per weight is a huge advantage. Not to mention that the car itself needs to have beefier suspension, tires and brakes for more weight (even though yes, on the braking side, EVs get regen braking - they still need to be able to stop quickly if something happens to the drivetrain). Also no danger of battery fires.

If this works out AND charge/discharge rates are good AND production scales fast enough, this could be huge in a few years. Of course it might also not be.

The incredibly unbelieveable smells-like-bullshit donut battery hit an even higher Wh/kg (not by much) in the new VTT test, but there’s still no guarantee that every test’s been on the same type of cell. Current leading theory is that they’re just taking a bunch of completely different cells to be tested and the solid state one might not be the same one that did all the other tests.