[AndrewDucker]

Lithium-Ion density has basically doubled over the last decade. And the cost has dropped by 2/3.

See figure 2 here: https://rmi.org/the-rise-of-batteries-in-six-charts-and-not-... and the data here: https://elements.visualcapitalist.com/charted-lithium-ion-ba...

(Both of these are a couple of years old. I'm sure there's newer data out there that looks even beter.)

Newer batteries chemistries are slowly arriving, but they mostly aren't replacing Li-ion because Li-ion is getting better all the time. Except in specific circumstances. Like the Sodium-Ion ones that work far better at low temperatures and entered mass production two months ago:

https://carnewschina.com/2026/01/22/catl-unveils-worlds-firs...