I think big breakthrough will be interchangeable battery-packs for instant refills at service-stations. The Japanese bike manufacturers are collaborating their designs around that. Hopefully automakers will as well.
And range should be next goal. Tesla's been focusing on getting more instantaneous power out of their cars and boasting faster and faster 1/4-mile drag-race times. How important is that for most people? How often do you do 1/4-mile drag-races during your commute? Range is more important and I'd love to see 1000-mile range between battery swaps.
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