As of January 29,2013, the Japan Transport Safety Board has cleared the Takamatsu battery of being defect, while the American National Transportation Safety Board continues to look for defects in the Boston battery.
As of January 29,2013, Bloomberg said the Japan Transport Safety Board has approved the Yuasa quality control and continues to investigate the damaged battery, but BBC said the battery was fine. Meanwhile, the American National Transportation Safety Board continues to look for defects in the Boston battery.