Article updated: 1/21/2013 4:43 PM

Boeing investigation turns to battery maker

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The distorted main lithium-ion battery, left, is contrasted with an undamaged auxiliary battery of the All Nippon Airways' Boeing 787 which made an emergency landing Wednesday at Takamatsu airport in Takamatsu, western Japan.

Associated Press

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Japanese and U.S. investigators began a probe Monday into the maker of the lithium ion batteries used in Boeing's grounded 787 jets. Tsutomu Nishijima, a spokesman for GS Yuasa, the battery manufacturer, said investigators visited the company's headquarters in Kyoto, Japan and that Yuasa was cooperating with the probe.