The Switzerland-based team attempting to fly a solar-powered plane around the world says the flight has been delayed until next April because of damage to its batteries.

The team says the batteries on the Solar Impulse 2 overheated during its five-day flight from Nagoya, Japan to Honolulu, Hawaii on June 30.

Pilot Andre Borschberg landed the Solar Impulse 2 near Honolulu on July 3, after traveling a record-breaking 118 hours across the Pacific Ocean. It was the most dangerous part of the plane’s 35,000-kilometer trip around the world because there was no place to land in an emergency.