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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.
Exactly. Really, "fully charged" should just be conceptualised as being at a sensible safe point, with the acknowledgement that it's possible to "overcharge" the batteries to an even higher level, chemically speaking, but that all sensible devices don't let you do this.