"Malaysia Airlines has revealed that an expired battery in the beacon of the 'black box' flight data recorder on missing Flight MH370 would have made no difference in the search for the plane.
Lawyers acting for some of the families of those on board said earlier that the fact the battery had not been replaced could be key in any legal action against the airline.
MH370 vanished shortly after taking off from Kuala Lumpur, bound for Beijing, early on March 8 last year, becoming one of the greatest mysteries in aviation history."
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