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Samsung’s 20-year-life EV battery runs 600 miles on 9-minute charge
(interestingengineering.com)
This is a most excellent place for technology news and articles.
Solid state batteries are more energy dense, meaning that if all you want is 300 miles of range on a charge (perfectly fine with it's faster charging), then you can have less battery for the same range. Now how much lighter I'm not sure, but it's in the right direction!