The biggest U.S. legacy automakers look to turn the losses from their underutilized electric vehicle battery capacity into a new profitable business to seize the soaring demand for battery storage energy systems. GM and Ford, which, due to poor demand, have written down billions of U.S. dollars of investments in the EV expansion push, are now pivoting to the energy storage business to meet the spike in demand for battery energy storage from data centers and infrastructure to support the electric grid. The underutilized electric vehicle battery…