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The Two Bit Da Vinci YouTube channel has a good video on solid state battery fundamentals and a deep dive into a battery company (ProLogium) that has demonstrated manufacturing at scale.

https://youtu.be/xQFVIs4leig?si=iOOt5gg_2MJAIoFR

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BYDs battery stress testing: https://www.youtube.com/watch?v=WPTgg3joL5E

Those use liquid electrolyte cells and the video is more promo than rigorous testing.

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