Multiple lithium-ion batteries exploded in Portland State University’s Engineering Building Tuesday morning, forcing more than 100 students and staff to evacuate the building for about two hours.

Video of the moment an e-bike battery exploded while it was on charge has been shared by West Midlands Fire Service, after its owner allowed the footage to be shared to warn others of the dangers.

Graves said students were using the batteries to power devices for a class project when the first battery exploded — but everyone apparently believed it was an isolated incident and carried on ...