Gigafactor is also producing the battery cells (though it might be Panasonic's tech) as well as the packs: https://en.wikipedia.org/wiki/Giga_Nevada https://en.

Gigafactor is also producing the battery cells (though it might be Panasonic's tech) as well as the packs: https://en.wikipedia.org/wiki/Giga_Nevada https://en.wikipedia.org/wiki/Giga_Nevada > the production rate of battery cells in the Gigafactory had reached 3.5 million '2170' cells per day.