KUALA LUMPUR, Malaysia — The first comprehensive report into the disappearance of Malaysia Airlines Flight 370 revealed Sunday that the battery of the locator beacon for the plane’s data recorder had expired more than a year before the jet vanished on March 8, 2014.

The report came as Australian Prime Minister Tony Abbott said the hunt for the plane would not end even if the scouring of the current search area off Australia’s west coast comes up empty.

Apart from the anomaly of the expired battery, the detailed report devoted pages after pages describing the complete normality of the flight, which disappeared while heading from Kuala Lumpur to Beijing, setting off aviation’s biggest mystery.

Families of the 239 people who were on board the plane marked the anniversary of the Boeing’s disappearance, vowing to never give up on the desperate search for wreckage and answers to what happened to their loved ones.

Despite an exhaustive search for the plane, no trace of it has been found. In late January, Malaysia’s government formally declared the incident an accident and said all those on board were presumed dead.