Tesla Semi’s Enormous Battery Might Weigh 11,000 Pounds on Its OwnBased on what we know about the Semi’s range and efficiency, the battery pack could have a capacity of 850 kWh.During the event, Tesla CEO Elon Musk revealed that the Semi is rated for 500 miles of range with a fully loaded trailer, which meant that the battery pack inside the truck would have to be absolutely ginormous.How big, exactly, is unknown; however, Musk took to Twitter early Friday morning to reveal roughly how efficient the truck is, which helps me make estimations about capacity and weight.Now, it's important to note that the total weight of the battery pack could vary depending on the type of cells used in production as well as the number of components in a battery pack.Still, a rough weight of 11,000 pounds for the pack alone shows just how heavy battery-powered vehicles can be."