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Batteries haven’t stagnated. Costs have come way down, densities have gone up, and recharge times have gotten faster. It’s just been more incremental than revolutionary.

Totally new battery ideas are in development but usually it takes 10-20 years for them to mature and have the potential to compete with existing tech. The hard parts are usually reliability, safety, and most of all manufacturing.

Manufacturing is the hard part for a lot of things. We can make 1nm and even smaller chip nodes today but not in quantity. The yield is really low, so these are prototypes and would be fabulously expensive if you tried to get some made. The “latest” node is the one we can manufacture with sufficient yield to be economical.