Now prompted by a Reuters report yesterday citing Samsung SDI sources claiming that they are in negotiation with Tesla to supply batteries for its cars, Elon Musk has confirmed that Panasonic will be exclusively supplying cells for the Model 3, S and X. A bill of lading between Tesla Motors and Samsung SDI at the Oakland port showed that the automaker took delivery of over 120 tons of Samsung SDI 18650 battery cells – the same format Tesla sources from Panasonic – in April 2016. Update: Elon Musk has now confirmed that the Samsung battery cells are for the Tesla Energy division: