Lithium-Ion batteries are not to be trifled with. They can be very dangerous things, as evidenced by massive recalls from companies like Samsung and Apple. You have to be very careful when flying with them, and some devices aren’t even allowed on flights anymore. Manufacturers do everything they can to try to ensure their batteries are safe, there is always a risk that one can go bad.
One went bad for one photographer, though when he says his Flashpoint branded Godox AD360 battery exploded on him. He put his batteries on charge the night before a session, as many of us do, when one of them started to swell. He unplugged it, and rushed outside with it, unprepared for exactly what would happen next. Fortunately, his security camera captured the whole event.