
Would like to clarify that Tesla is working exclusively with Panasonic for Model 3 cells. News articles claiming otherwise are incorrect.
— Elon Musk (@elonmusk) June 8, 2016
Speaking to The Verge, a Tesla spokesperson revealed that the company “works with all the leading battery suppliers around the world, [but] Panasonic has been [its] battery cell supplier throughout the Model S and Model X programs,” so it makes perfect sense for the car manufacturer to be “working very closely with Panasonic to ramp up battery cell production at the Gigafactory for Model 3” as there's no need to alter a partnership that's proved to be extremely effective in the past.