> "Batteries are heavy. That’s why, generally, electric cars weigh considerably more than otherwise similar gasoline-powered vehicles"
Knoll's law.
> I just looked up the weight of my little car's engine, it's just 69 kg (152 lbs).
Gosh, so heavy. That's more than twice as much as the 365hp motor in the Model S!
How much is the transmission, alternator, water pump, radiator, coolant, exhaust system, fuel tank and fuel?
The main difference here is that the weight of a gasoline car is proportional to the size of the car, because a bigger car needs a bigger engine and transmission and all of that. A bigger electric motor adds a trivial amount of weight and you recover most of what's needed to accelerate a larger mass from regenerative braking, so the weight of the battery is proportional to the range.
But for a normal midsized car as you might see in the US, the weight is about the same even for a range in excess of 300 miles. It should be possible for an electric truck to weigh less, because you can put a 500hp electric motor in it (which is still light), remove the 900lb engine and 350lb transmission and all of that, and have well over 1000lbs left for the battery before it's actually heavier.
If you want a tiny little thing you can still make it arbitrarily light, you're just going to have to charge it more often then. But the average commute is 41 miles.