This begs the question: "Just how did engineers at Tesla get the electric, seven-seat family sedan to go so fast?" The easy answer — they've gone from their top-of-the-line 90 kWh battery to an (even bigger) 100 kWh battery: "They're adding a bigger battery, and adding a bigger battery makes it more powerful," explains Mike Duoba, a mechanical engineer at Argonne National Laboratory in Illinois, who develops standards for hybrid plug-in vehicles. But it goes deeper than that, electric vehicles also have inherent, built-in advantages.