The only question is if the rules will mind the difference in battery composition and chemistry.
Samsung says they will ship some solid state batteries in watches and earbuds this year, where the batteries are so tiny they're affordable. Even solid state batteries for phones are still too costly. Everybody in the industry is trying to solve the production price problem. Consensus is that the price starts to come down around 2028 or so.
Lithium iron phosphate batteries don't have a thermal runaway problem, either, but they have about half the Wh/Kg of lithium-ion, so they're not popular for portable devices.
Ten years out, lithium-ion batteries will probably be obsolete technology and totally prohibited on aircraft.
They sent in multiple cells for lab testing, but more importantly the second Donut demo was a motorcycle charging.
They have until Tuesday.
Fun fact though:
> Between 1831 and 1834, Michael Faraday discovered the solid electrolytes silver sulfide and lead(II) fluoride, which laid the foundation for solid-state ionics. Through his research, Michael Faraday took note of these solid compounds transitioning from insulators to conductors after being heated. While this would take almost another century to be acknowledged by Michael O'Keeffe in 1976, this mixed ionic/electronic conductions became the first record of a solid-state battery
(emphasis mine)
The real production solid states are made with inorganic materials, many not in pouches nor cylinders, and has wild environmental resistance like supporting charges in -55 to +125C(-70 to +260F) which won't be possible with most water inside.