But with B-share holders calling the shots, such firms tend to underinvest, leading to lower sales growth and valuations than with single-share-class firms, according to a study by Harvard Business School's Paul Gompers, Stanford's Joy Ishii and Wharton's Andrew Metrick.

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Officials from Japan's Land, Infrastructure, Transport and Tourism Ministry and the FAA conducted a site inspection of GS Yuasa's headquarters in Kyoto, Japan, on Monday and Tuesday, said Yasuo Ishii of Japan's Civil Aviation Bureau.

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The investigation has now shifted from the battery maker to the manufacturer of the system that monitors the battery's voltage and temperature, Ishii said.

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