This is the answer. It'd be faster to take the whole battery out and leave it charging and put another one in fully charged (I've seen videos of someone doing that with electric motorcycles in Taiwan iirc).

Now, hydrogen cell cars are electric and they are charged very fast, but they are not competitive in small cars and it's impossible to find a charging station in the middle of nowhere since H2 can't be pumped all the way there. They will replace buses, trucks and large ships soon, tho, because as batteries price go up, making hydrogen from water remains cheap.