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The battery industry has entered a new phase.
(www.iea.org)
This is a most excellent place for technology news and articles.
I don't see why they don't make sense for cars. Put them in commuters where distance is less important than economy. I don't see why they couldn't make a ton of sense as a second car.
Buses that could run self powered on side streets, yet charge using overhead power lines installed over main roads.
Would pretty much combine the energy savings of electric rail with last-mile service via bus routes.