EV battery weight. An EV battery''s weight is determined by its size and energy storage capacity. Usually, the bigger the battery, the more energy it can store and the more it weighs. For example, 6 to 12 kilowatt-hour (kWh) batteries typically weigh between 100 and 150 kg, while 60 to 100-kWh batteries range from 350 to 600 kg. Of …