A five-minute charge for an EV, virtually as quick as a gasoline fill-up, has long seemed a quixotic dream.Now electric Don Quixotes can save critical time on their quests, at least in China. BYD’s “megawatt charging” is here. And the company’s 1,000-kilowatt fast chargers could eliminate perhaps the biggest consumer gripe over EVs: That they take too long to charge. BYD, the automaker that has passed Tesla in global EV sales, demonstrated its record-setting tech in Beijing during the recent Sha...