Technology
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How much better than conventional batteries are we talking?
Depends on who you ask. The main advantage is better cycle life and being able to charge faster. That will address the concerns most people have about EVs. There will also be advantages in energy density and manufacturing cost but right now it's really difficult to say where we'll land in that regard.
To be honest, current batteries are already designed to last over 10 years. And with them charging at over 100kW, a 15min break every 3h of travel is all you really need (and you should do anyway for you own sanity).
I agree that people are anxious because of these reasons, but just because they have never really tried long range travel with an EV.
I agree but public perception does not. Which of course is a result of years of relentless propaganda.