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Japan Fails to Find Cause of ANA Boeing 787 Battery Heat

Japan’s transportation authority failed to find the cause of a lithium-ion battery meltdown on a Boeing Co. 787 almost a year after the incidents led to a three-month grounding of the fleet by U.S. and Japanese regulators.

A build-up of lithium, a metal fragment or damage to a cell separator may have caused a short circuit in the battery, the Japan Transport Safety Board said in a statement today. The board’s probe focused on a battery that overheated aboard an ANA Holdings Inc. flight last year.