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Last week, governments across the world grounded the Dreamliner jet after a problem with a lithium-ion battery on a second 787 plane, flown by All Nippon Airways forced the jet to make an emergency landing in western Japan.

The agency said in a statement forwarded by a Boeing Japan representative that examination of the flight recorder data from the JAL B-787 airplane indicated that the battery in the auxiliary power unit "did not exceed its designed voltage of 32 volts."

On Friday, a Japanese safety official told reporters that excessive electricity may have overheated the battery in the ANA-owned Dreamliner, which was forced to make an emergency landing at Japan's Takamatsu airport last week.

American investigators have examined the lithium-ion battery that powered the auxiliary unit, where the battery fire started in the JAL plane, as well as several other components removed from the airplane, including wire bundles and battery management circuit boards, the safety agency statement said.

On Tuesday, the investigating group will convene in Arizona to test and examine the battery charger and download nonvolatile memory from the controller of the auxiliary power unit, it added.

The GS Yuasa Corporation of Japan makes the batteries for the Dreamliner, while Thales of France makes the control systems for the battery.