This Thursday, Jan. 17, 2013 photo provided by the Japan Transport Safety Board shows the distorted main lithium-ion battery, left, and an undamaged auxiliary battery of the All Nippon Airways' Boeing 787 which made an emergency landing on Wednesday, Jan. 16, 2013 at Takamatsu airport in Takamatsu, western Japan. Japanese and U.S. investigators are conducting a probe of the maker of the lithium ion batteries used in Boeing?s 787 ?Dreamliner.? Tsutomu Nishijima, a spokesman for GS Yuasa, said Monday, Jan. 21 that the investigators visited the company?s headquarters in Kyoto, Japan, and that Yuasa was cooperating with the probe. (AP Photo/Japan Transport Safety Board) EDITORIAL USE ONLY, NO SALES
This Thursday, Jan. 17, 2013 photo provided by the Japan Transport Safety Board shows the distorted main lithium-ion battery, left, and an undamaged auxiliary battery of the All Nippon Airways' Boeing 787 which made an emergency landing on Wednesday, Jan. 16, 2013 at Takamatsu airport in Takamatsu, western Japan. Japanese and U.S. investigators are conducting a probe of the maker of the lithium ion batteries used in Boeing?s 787 ?Dreamliner.? Tsutomu Nishijima, a spokesman for GS Yuasa, said Monday, Jan. 21 that the investigators visited the company?s headquarters in Kyoto, Japan, and that Yuasa was cooperating with the probe. (AP Photo/Japan Transport Safety Board) EDITORIAL USE ONLY, NO SALES
A company names are seen atop the headquarters of GS Yuasa Corp., the maker of lithium-ion batteries used in Boeing 787 "Dreamliner," in Kyoto, western Japan as Japanese and U.S. investigators conduct a probe of the maker Monday, Jan. 21, 2013. Tsutomu Nishijima, a spokesman for GS Yuasa, said Monday that the investigators visited the headquarters and that Yuasa was cooperating with the probe. (AP Photo/Kyodo News) JAPAN OUT, MANDATORY CREDIT, NO LICENSING IN CHINA, HONG KONG, JAPAN, SOUTH KOREA AND FRANCE
Cars are parked in front of the headquarters of GS Yuasa Corp., the maker of lithium-ion batteries used in Boeing 787 "Dreamliner," in Kyoto, western Japan as Japanese and U.S. investigators conduct a probe of the maker Monday, Jan. 21, 2013. Tsutomu Nishijima, a spokesman for GS Yuasa, said Monday that the investigators visited the company?s headquarters in Kyoto, Japan, and that Yuasa was cooperating with the probe. (AP Photo/Kyodo News) JAPAN OUT, MANDATORY CREDIT, NO LICENSING IN CHINA, HONG KONG, JAPAN, SOUTH KOREA AND FRANCE
TOKYO (AP) ? 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.
All 50 of the 787 Dreamliners that Boeing has delivered to airlines were grounded after an overheated battery forced the emergency landing of an All Nippon Airways 787 flight last week in western Japan. Boeing has halted deliveries of new planes until it can address the electrical problems.
Monday's investigation involved an introductory meeting and factory tour, with deeper studies into product quality and other issues to follow as the probe continues, said Tatsuyuki Shimazu, the chief air worthiness engineer at the Civil Aviation Bureau's Aviation Safety Department.
Two investigators from the U.S. Federal Aviation Administration and an investigator from Japan's government were conducting the probe into how the batteries are made and assembled and into any quality issues, he said.
"We are in the midst of collecting information, so as to whether there is a problem or not has not yet been determined," Shimazu said.
Nishijima of GS Yuasa said he could not comment on details of the investigation.
The burned insides of the ANA battery showed it received voltage in excess of its design limits. However, a battery that caught fire in a Japan Airlines Boeing 787 in Boston earlier this month was found not to have been overcharged.
U.S. government investigators said there could still be problems with wiring or other charging components.
In the U.S., investigators from the National Transportation Safety Board planned to meet Tuesday with officials from Securaplane Technologies Inc., manufacturer of the charger for the 787s lithium ion batteries, at the company's headquarters in Tucson, Ariz., said Kelly Nantel, a spokeswoman for the board.
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