Japan 787 battery investigators look to latest overheating for clues to earlier meltdown

TOKYO, Jan 29 (Reuters) - Japanese investigators probing a lithium-ion battery meltdown on a Boeing Co 787 jetliner a year ago are looking at an a battery that overheated on a Dreamliner in Tokyo this month to help unlock the cause of the earlier fire, an official from the Japan Transport Safety Board said on Wednesday.