TOKYO :Panasonic Holdings will postpone its plan to bring its new U.S. electric vehicle battery plant to full capacity by March 2027 as Tesla, its main customer, is experiencing sluggish sales, the Nikkei business daily reported on Friday. The new target date to reach full production of 30 gigawatt-hours at the $4 billion plant in the U.S. state of Kansas has yet to be fixed, the Nikkei said. Panasonic said it could not immediately comment. The Kansas plant, Panasonic's second large-scale