Of course if you are designing an EV from scratch you want to put the weight of the battery low and in the center for best stability, but with a conversion you

Of course if you are designing an EV from scratch you want to put the weight of the battery low and in the center for best stability, but with a conversion you gotta find space wherever. Gas tanks are already pretty low and central for the same reason, but clearly an EV battery pack is a lot denser than a full tank of gasoline. Swappable battery packs clearly wouldn't be a single piece, as there are going to be a variety of different bays and sizes. They'd need to be smaller, portable, and stackable, like rectangles or hexagons. It's not really that hard to do if you design for it. If the batteries are under the car then a lift or underground bay you drive onto is fairly easy to do. Or you could just have a kind of dolly that slides under the car and can detach/reattach them. The fact that we never really thought in this direction seems like a blind spot. I mean, look at how pit crews for racing work. The whole car is designed to be swappable in seconds flat, and also for minimum weight and maximum speed. It's just engineering and design investment.