UPDATE 1-Panasonic confirms will invest in $5 bln Tesla battery plant
July 31, 2014 at 04:11 AM EDT
TOKYO, July 31 (Reuters) - Panasonic Corp confirmed on Thursday it would invest in U.S. electric carmaker Tesla Motors Inc's planned $5 billion lithium-ion battery plant in the United States, but said it had yet to decide on the size of its investment.