https://spectrum.ieee.org/solid-state-battery-2675554640Big if true. Could be BS, you decide.
The claims are dramatic. Donut says its solid-state battery can charge to 80 percent of capacity in as little as five minutes, endure 100,000 cycles and deliver 400 watt-hours per kilogram of energy density, versus the 200-300 Wh/kg of typical lithium-ion cells.
If that's true than ICE's are done, forever. No doubt about it.