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Musk and Tesla shock Panasonic investors with battery ambitions

EV maker plans for in-house production to outstrip its supply from Japanese partner

Tesla revealed Tuesday that it intends to produce 100 gigawatt-hours' worth of battery cells by 2022, roughly three times what Tesla purchases from Panasonic today.   © Reuters

PALO ALTO, U.S. -- Tesla's planned shift to in-house production of electric vehicle batteries has caused investors to question the automaker's partnership with longtime Japanese cell supplier Panasonic.

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