You need to distinguish between battery cells and battery packs - a pack being thousands of cells combined with complex monitoring, heating and cooling systems.

You need to distinguish between battery cells and battery packs - a pack being thousands of cells combined with complex monitoring, heating and cooling systems. Cells are made at the gigafactory by panasonic (to a tesla design). But the battery packs are manufactured by Tesla, and there is a lot of engineering and innovation in the packs themselves.