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The first EV with a lithium-free sodium battery hits the road in January
(www.engadget.com)
This is a most excellent place for technology news and articles.
Then buy it. No need to rent it then.
The main focus was on flexible energy packs not on the renting, although I'd find it convenient if done right.
You have far more faith in capitalists to do the right thing than I. They'll put this shit behind user hostile DRM the same that Disney does for drink refills.