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Problem is the battery packs. These kits need batteries and the best and cheapest batteries come out of wrecked teslas. If Tesla is allowed to continue locking down their batteries behind proprietary battery controllers the parts aren’t parts they’re intellectual property which Tesla can turn off at their convenience. And it’s super convenient for them to render parts unusable in the secondary market.

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The cells are just normal cells. The proprietary bits are the management systems which you could theoretically just bypass.

Tesla’s batteries are modular, and you can easily repurpose them. Yes, you’ll need a new charge controller, but that’s it.

More often than not, you’d want your own charge controller anyway to for example run at a lower voltage (different series). At least for the Model S/X modules. The 3/Y modules are a little bit trickier to re-use because they are higher-voltage and not as modular.

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