Except that they can't travel 400 miles. 250 miles is more like it. Now, here's the thing: The nearest city to me is 90 miles away. I want to go to the city tomorrow, driving my electric car. Because it's so far away, I've planned a number of stops in the city, involving driving about 60 miles around the city. 90 miles into the city. 60 miles driving around the city running errands. 90 miles home. 240 miles. My car dies 10 miles from my driveway.
So, I take half an hour to charge my car while I'm in the city. Total drive time to and from the city, three hours. Drive time around the city, two hours. Charge time, 30 minutes. I increase travel time by 10% to charge my car.
Compare that to a comparably sized car with an ICE. I'll use my Honda Fit. It routinely got 40 miles per gallon on the highway, and 28 in the city. So, I fill up the 10 gallon tank before I leave home. Drive to the city, I've used 2 gallons of fuel. Drive around the city, I've used another 3 gallons of fuel. Drive home, I use another two gallons, for a total of 10 gallons of fuel. I'm on fumes when I park the car, so when I arrive in my town, I stop at the gas station and fill the tank, taking five minutes.
I'm entirely in favour of electric cars. But, I won't buy one until I can drive to the city, drive around the city, and drive home without charging.