The weight is substantial. The Lithium-ion packs in the Model S, for example, weighs over 500KG. One of the largest engines in a current production car, the Dodge 8.4L V10, is 42% lighter. Smaller turbo petrols weigh just a fraction of that.
(I am comparing just the weights of the power plants, not the power plant + drivetrain which would include gearboxes, differentials and electric motors).
(I am comparing just the weights of the power plants, not the power plant + drivetrain which would include gearboxes, differentials and electric motors).