TOKYO (AP) — The troubles with Boeing’s 787 Dreamliner are drawing an unwelcome spotlight for the Japanese maker of the powerful lithium-ion batteries that have become the focus of investigations into onboard fire risks.

Kyoto, Japan-based GS Yuasa Corp. said it began working Thursday with investigators probing the cause of recent problems with the 787. An overheated leaking battery prompted an All Nippon Airways jet to make an emergency landing on Wednesday, leading regulators in Japan, the U.S., India and Europe to ground the planes.