The Solar Impulse 2's team says the batteries were over-insulated and became overheated on day one of the Japan-Hawaii leg. The team said Saturday that it monitored the situation throughout the flight but could not decrease the temperature.
The plane won't fly before the beginning of August as the team works to replace and repair damaged parts.
The plane landed in Hawaii on July 3 after completing a 118-hour voyage that broke the record for the world's longest nonstop solo flight.
