IMCA

The crew member to whom it belonged was woken up by the explosion and started to extinguish the fire with a soaked towel. A “pre-warning” fire alarm sounded on the bridge and crew proceeded to the cabin to investigate the alarm, but the fire was already put out. There was minor damage to fittings and furniture in the cabin.

This had the potential for escalation to a larger cabin fire, smoke damage to adjacent areas, activation of fire systems, loss of accommodation, and possible injury from burns or smoke inhalation. The fire was extinguished. The crew member reacted quickly and smothered the fire with a wet towel.

https://www.imca-int.com/resources/safety/safety-flashes/0526-battery-power-bank-explodes-in-cabin/