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oldbones said..
Can over come the slow charging times. You don't have charging stations on the highways or around town. You have battery change out stations. All the vehicles made at the giant nuclear powered Aussie electric vehicle factory have the same battery. Little cars have one battery, big cars two, fast cars four, trucks eight. You still have charging station at home, and a spare battery.
There was an Israeli company (Better Place) that had that idea years ago. In the end they failed and the company folded, for a few reasons, but mainly because they couldn't get car manufacturers to agree on using a single standardised battery type across all makes and models.
Battery capacity, longevity, weight, cost and recharging times are going to be the major selling point of difference between different cars, so why would you choose a BMW over a cheap Hyundai if the one of the main driving components is exactly the same across all ranges?
Secondly battery tech is constantly improving and evolving. By the time they setup a swap & go network around the country, those batteries would already be superseded, so they would have to start stocking a second type of battery for all the newer cars. After 10 years there would be 10 different battery types that would need to be stocked by each servo and on and on... It's bad enough now we have LPG, Diesel, and 3 or 4 flavours of petrol.