This Jan. 17, 2013 photo provided by the Japan Transport Safety Board shows the distorted main lithium-ion battery and its lid, left, of the All Nippon Airways' Boeing 787 which made an emergency landing on Wednesday, Jan. 16, 2013 at Takamatsu airport in Takamatsu, western Japan. At right are the model in normal condition. U.S. safety officials and Boeing inspectors joined a Japanese investigation Friday into the 787 jet at the center of a worldwide grounding of the technologically advanced aircraft. The pilot of the ANA plane made an emergency landing Wednesday morning after he smelled something burning and received a cockpit warning of battery problems. All passengers evacuated the plane on emergency slides. (AP Photo/Japan Transport Safety Board) EDITORIAL USE ONLY, NO SALES

Associated Press
This Jan. 17, 2013 photo provided by the Japan Transport Safety Board shows the distorted main lithium-ion battery and its lid, left, of the All Nippon Airways' Boeing 787 which made an emergency landing on Wednesday, Jan. 16, 2013 at Takamatsu airport in Takamatsu, western Japan. At right are the model in normal condition. U.S. safety officials and Boeing inspectors joined a Japanese investigation Friday into the 787 jet at the center of a worldwide grounding of the technologically advanced aircraft. The pilot of the ANA plane made an emergency landing Wednesday morning after he smelled something burning and received a cockpit warning of battery problems. All passengers evacuated the plane on emergency slides. (AP Photo/Japan Transport Safety Board) EDITORIAL USE ONLY, NO SALES
This Jan. 17, 2013 photo provided by the Japan Transport Safety Board shows the distorted main lithium-ion battery and its lid, left, of the All Nippon Airways' Boeing 787 which made an emergency landing on Wednesday, Jan. 16, 2013 at Takamatsu airport in Takamatsu, western Japan. At right are the model in normal condition. U.S. safety officials and Boeing inspectors joined a Japanese investigation Friday into the 787 jet at the center of a worldwide grounding of the technologically advanced aircraft. The pilot of the ANA plane made an emergency landing Wednesday morning after he smelled something burning and received a cockpit warning of battery problems. All passengers evacuated the plane on emergency slides. (AP Photo/Japan Transport Safety Board) EDITORIAL USE ONLY, NO SALES
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