this post was submitted on 25 Apr 2024
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There's an entire legion of dead battery companies (ex: A123, now acquired by some Chinese company) in the 2010s. A123 was the company making the batteries for the Chevy Spark EV, for example.
I don't think pointing out the (now virtually dead) US Battery supplier market is where you want to go.
Note: cells and batteries are different. Tesla has fine battery tech (overrated, but fine). "Cells" are purchased from Panasonic or CATL. Cells are chemistry, batteries are electronics (hooking cells together and having safety computers balancing voltages, currents, and other attributes).
Tesla did dip into 4680 cells / chemistry, but has basically failed at it so far. Only their batteries (ie: buying Panasonic or CATL and then putting them together) has been successful. But that's where many other companies came and died in 2010s in practice.