Chetan Maini has often been a trendsetter. Much before the Teslas, Athers and Olas of the world, Maini, now chairman of battery swapping major Sun Mobility, co-founded Reva, India’s first electric car company in the 1990s. The world was then busy guzzling diesel and warming the earth. But Reva remained a trial for customers, before Maini sold it to Mahindra, which subsequently gave it a quiet burial. But the Stanford alumnus moved on to start a battery swapping business in 2017, again a bit early for its time. Maini (54) has now roped in state-run refiner Indian Oil, India’s biggest