The battery in an electric vehicle weighs more, but the motor is around 95% efficient, and the motor is lighter than the ICE engine. Most electric cars only have one ‘gear’ because the motor has high torque at all speeds. This eliminates the need for a transmission, which is another source of waste (and weight) with an ICE. Finally, with an electric car you can do regenerative braking, which captures quite a lot of the energy that would otherwise be warming your brake disks, and recharges the battery.
