A Panasonic Corp staff poses with a lithium-ion battery, which is part of Tesla Motor Inc's Model S and Model X battery packs, in front of the chassis of a Tesla Model S during a news conference at ... more 
A Panasonic Corp staff poses with a lithium-ion battery, which is part of Tesla Motor Inc's Model S and Model X battery packs, in front of the chassis of a Tesla Model S during a news conference at the Panasonic Center in Tokyo, in this November 19, 2013 file photo. Panasonic Corp is considering investing in a U.S. car battery plant planned by Tesla Motors Inc, sources familiar with the plan said on February 26, 2014, with total investment estimated by one source around 100 billion yen ($979 million). REUTERS/Yuya Shino/Files (JAPAN - Tags: TRANSPORT BUSINESS) less 
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Reuters | Photo By YUYA SHINO / REUTERS
Tue, Feb 25, 2014 11:27 PM EST