Article updated: 1/23/2013 7:05 AM

Japan probe finds 787 battery not overcharged

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A grounded All Nippon Airways' Boeing 787 on the tarmac at Haneda airport in Tokyo.

Associated Press

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A lithium ion battery on a Boeing 787 that overheated during an All Nippon Airways flight earlier this month experienced a sudden drop in voltage and was not overcharged as previously thought possible, Japan's transport safety agency said Wednesday. Japan Transport Safety Board chairman Norihiro Goto told reporters the jet's data recorder showed the main battery, used to power many electrical systems on the jet, did not exceed its maximum voltage.