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I think this topic probably needs it's own thread but you are correct, the technology is constantly improving and we are moving towards a point where E Cars are becoming more and more economically viable, the challange at the moment I believe is producing enough batteries which is why companies like Tesla are creating their Giga factory. If you are into electric cars the 'Fully Charged' channel on youtube has some informative and entertaining videos on the subject.
Now if they could just do cleaner batteries that stored a shit load and lasted forever!