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EV battery swaps will be tested with the Fiat 500e in 2024
(arstechnica.com)
This is a most excellent place for technology news and articles.
Some pretty heavy and expensive machinery is required for the swaps. If there are multiple battery standards, now those facilities need to invest in even more expensive and heavy machinery variants as well as stock even more horrendously expensive batteries. The idea was impractical to start, now there is this monumental added expense.