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Samsung delivers 600-mile solid-state EV battery as it teases 9-minute charging and 20-year lifespan tech
(www.notebookcheck.net)
This is a most excellent place for technology news and articles.
Size constrains probably.
SSB can be a quite a lot denser compared to existing ones. Up to 2.5x if I recall correctly. Also less flammable. Edit: consider -> compared