Tesla does manufacture their own battery cells, though they're having trouble scaling up. https://www.reuters.com/business/autos-transportation/inside-teslas-d

Tesla does manufacture their own battery cells, though they're having trouble scaling up. https://www.reuters.com/business/autos-transportation/inside-teslas-drive-keep-musks-battery-promise-2022-09-06/ https://www.reuters.com/business/autos-transportation/inside...