One of the issues is the battery is the heaviest part of the car, and tend to be pretty large. Most EVs today are basically built around the battery, using it a

One of the issues is the battery is the heaviest part of the car, and tend to be pretty large. Most EVs today are basically built around the battery, using it as a foundation that everything else attaches to. Making it replaceable means sacrificing range, because the battery must be smaller and there's more weight for a frame to hold the battery pack(s). This is in addition to the more practical problems such as standardizing packs, network of swap stations, ownership of the batteries. If the packs are big you need a machine at every station (which can break), but if they're small enough for a driver to swap you sacrifice even more range and increase other potential problems like theft.