That would also remove range anxiety for me. However, this will only work if batteries become smaller and more energy-dense - because they are huge and heavy,

That would also remove range anxiety for me. However, this will only work if batteries become smaller and more energy-dense - because they are huge and heavy, electric cars today are built around them. This causes two problems: You can’t easily remove them because they’re big and have to be built into the structure of the car, and are sometimes lod-bearing, and each car model has a different shape of battery.