Exponential is the wrong word, but there is an expected 1000% increase in battery deployment each year, and with that is coming record investment in R&D, and once the bigger players get on board there is no reason we shouldn't expect batteries to get exponentially better.
What happened over 2.5 decades and what happened the last 5 years is not comparable. Even 10 years ago nobody would have thought that we'd see 400km + range on a EV.
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