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It's going to be as easy to get electric car makers to make a standard size and shape of battery as it would be to get gasoline auto makers to all use the same engine in all of their vehicles.
as for swapping out the "guts" there are very few batteries that use a liquid that could be pumped in and out that also work well and are cheap enough to use in a vehicle, with lithium batteries it would be like taking a book and scraping the print off the pages and putting new print on and if you get a spec of moisture in there you fail.
also the electrical connections become a fussy point as well, 60,000 to 100,000 watts of power is a lot to have going threw a plug on a battery pack.
best option is slow charging at night at home and when you want a long trip, take the train or fly or rent a diesel car.
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