Times (UK): SHAI AGASSI travelled halfway round the world to change a battery last week. He flew from his home in San Francisco to watch a platform scuttle along a set of metal rails, stop at an electric car, remove the vehicle’s old battery and replace it with a new one. As the metallic ballet played out, Agassi beamed. It seemed a long way to travel for so little, but what happened in Yokohama was the culmination of a five-year ambition that might change the way we think about our cars and much …