US regulator asks Boeing for full battery history

U.S. transport safety regulators have asked Boeing Co. to provide a full operating history of the lithium-ion batteries used in its grounded 787 Dreamliners.

The National Transportation Safety Board said in a statement it made the request after recently becoming aware of battery incidents that occurred before a Jan. 7 battery fire in a 787 parked at Boston's Logan International Airport.

All Nippon Airways said Wednesday it had replaced batteries on its 787 aircraft some 10 times because they failed to charge properly or showed other problems, and informed Boeing about the swaps.

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.