Panasonic makes the actual batteries at Gigafactory on Panasonic owned/operated lines that happen to lease space inside a Tesla building. https://en.wikipedia.

Panasonic makes the actual batteries at Gigafactory on Panasonic owned/operated lines that happen to lease space inside a Tesla building. https://en.wikipedia.org/wiki/Gigafactory_Nevada#Operations https://en.wikipedia.org/wiki/Gigafactory_Nevada#Operations