Motherboard battery failure.

母板电池故障。

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RAID Controller battery failure.

RAID 控制器电池故障。

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Motherboard battery failure. Check battery.

母板电池故障。请检查电池。

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Those tests apparently led the airplane builder to greatly underestimate the chances of battery failure, the safety board said.

CNN: Boeing can conduct Dreamliner test flights

As part of their investigation, Japanese and U.S. experts want to determine if an internal battery failure, or defective lithium-ion cell, was the ignition source in either of the two incidents.

WSJ: All Boeing Dreamliners Are Grounded

"The safety of the flying public is our top priority and we won't allow the 787 to return to commercial service until we're confident that any proposed solution has addressed the battery failure risks, " it said.

BBC: Dreamliner: Japan's ANA cancels more Boeing 787 flights