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All Nippon Airways' Boeing 787 passenger jets park on the tarmac at Haneda airport in Tokyo, Jan. 18. / Koji Sasahara, AP

Japan's All Nippon Airways replaced lithium-ion batteries on its 787 Dreamliners 10 times before the jets were grounded worldwide due to battery problems, ANA has revealed.

ANA spokeswoman Megumi Tezuka told the Associated Press Wednesday the airline was not required to report the battery swapping cases to Japan's Transport Ministry because they did not raise safety concerns and did not interfere with flights.

She said the batteries were replaced because they failed to charge properly or showed other problems.

Boeing, which manufactures the Dreamliners, was informed.

U.S. regulators said Wednesday they asked Boeing Co. to provide a full operating history of lithium-ion batteries used in its grounded 787 Dreamliners.

The battery problems experienced by ANA before the emergency landing were first reported by The New York Times. All Nippon told The Times that in five of the 10 replacements, the main battery had showed an unexpectedly low charge.

In Seattle, Boeing spokeswoman Kate Bergman told USA TODAY that the company was aware of The Times report but had no comment.

All 50 of the Boeing 787s in use around the world were grounded after an ANA flight on Jan. 16 made an emergency landing in Japan when its main battery overheated. Earlier, a battery in a Japan Airlines 787 caught fire while parked at Boston's Logan International Airport.

In the United States, the National Transportation Safety Board and Federal Aviation Administration are conducting an investigation of the Boeing 787's battery problems.

Boeing faced further scrutiny on Wednesday as the Dow Jones Industrial Average-listed company reported fourth-quarter earnings. However, the plane maker said it foresees "no significant impact" on its earnings or plans going forward from the recent problems with the 787 Dreamliner.

Contributing: The Associated Press



Copyright 2014 USATODAY.com

Read the original story: Japan's ANA: Dreamliner batteries replaced 10 times

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