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Chinese EV maker BYD says new fast-charging system could be as quick as filling up a tank
(www.theguardian.com)
This is a most excellent place for technology news and articles.
Rubber is cheap though, and flexible. If it's the size of a gas pump hose, oh well; gas pump hoses are also rubber. As long as they don't have to make the copper ridiculously thick, it shouldn't matter how thick the cable overall is