No, Tesla doesn't build a single battery. Panasonic actually does it in Nevada for them. These guys have a contract. Panasonics equipment, workforce, technology!

> https://asia.nikkei.com/Business/Technology/Tesla-strikes-new-Panasonic-battery-deal-as-sales-and-shares-soar#:~:text=PALO%20ALTO%2C%20U.S.%20%2D%2D%20Tesla,Panasonic%20for%20lithium%2Dion%20batteries.

For the Teslas that are build in China the batteries come from LG Chem

https://www.reuters.com/article/us-lg-chem-telsla-batteries-exclusive/exclusive-lg-chem-to-double-china-battery-capacity-to-meet-tesla-demand-sources-idUSKBN28B3R9

and CATL

https://electrek.co/2021/06/28/tesla-signs-battery-cell-agreement-with-catl-race-secure-large-supply/

Sorry mate, but Tesla isn't building a single battery!