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EV batteries more reliable than predicted.
(news.yahoo.com)
This is a most excellent place for technology news and articles.
There's already a company positioned to take "dead" ev batteries, referb them and put them into municipal power storage. I'd guess it'll be the sort of situation where, if you can replace them yourself then the cells are yours to do with as you please, but if you go to a shop to have them replaced the shop will probably resell your cells.