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EVgo charging station in Union City, California with resused BMW i3 battery backupAutomakers are launching a race to build electric cars that can charge as fast filling a gas tank. When the first electric cars launched in 2011, buyers and fans were clamoring for CHAdeMO fast charging that operates at about 50 kilowatts and could recharge a short-range electric car (to 80 percent capacity) in about a half hour. When Tesla's...