Reuters exclusively reported in February that Tesla is in advanced talks to use LFP batteries from CATL that contain no cobalt - one of the most expensive metals in electric vehicle (EV) batteries - in cars made at its China plant.

The document does not show the name of the battery maker.

Tesla did not immediately respond to a request for comment.

The US car maker is building Model 3 vehicles at its Shanghai factory. It uses EV batteries from Panasonic Corp and LG Chem. CATL has said it would start supplying Tesla from July.