Newsweek: Drinkable battery acid? Yes, it’s true. In the tough race to develop the world’s best electric-car battery, Chinese billionaire Wang Chuanfu, founder of the automaker BYD, is not above a little showmanship. In front of visiting journalists, he eagerly downs a glass of nontoxic electrolyte solution, a concoction being used in an experimental battery that will be 100 percent recyclable. This stuff may taste all right, but whether it will power the next generation of electric cars is …