Boeing 787 Battery Woes Stump Investigators Prolonging Grounding

Boeing 787 Battery Woes Stump Investigators Prolonging Grounding

Yuzuru Yoshikawa/Bloomberg

All 50 Dreamliners in service around the world have been grounded since Jan. 16 after an All Nippon Airways Co. 787 made an emergency landing because one of its lithium-ion batteries smoked and became charred.