In 18 97, the best selling vehicle is an electric car. The batteries all led usti batteries big, the heavy. They don't storl much energy if they take a long time to recharge. Still, we should say here that new technologies are rarely perfect out of the box. Think about how most people see block chain technology to day. Will that change in ten or 20 years? i'm guessing the answer is yes - and that early scepticism will be forgotten.