A lithium-ion battery from an electric scooter ignited a downtown Honolulu warehouse last week, setting a three-story mixed-use building ablaze and leaving behind an estimated $125,000 in damage. Investigators now say the fire was accidental, with the battery experiencing thermal runaway.
The Honolulu Fire Department said the 911 call came in just after 11 p.m. Friday, and the first crew arrived minutes later to find the building heavily involved in fire. Eleven units staffed by 40 personnel attacked the blaze, bringing it under control early Saturday and fully extinguishing it shortly afterward, according to the department's initial incident report.
The department's follow-up investigation identified the origin as an electric scooter at the south end of the first-floor warehouse and classified the cause as accidental, KHON2 reported. HFD estimated $100,000 in property damage and another $25,000 in damaged contents, adding a costly new chapter to the earlier account of the blaze, which reported no injuries and no occupants inside.
Thermal Runaway Turns A Battery Into A Fire Hazard
Thermal runaway is a chain reaction in which a lithium-ion battery rapidly overheats and can produce intense flames, toxic smoke and explosive pressure. A Hawaii Department of Health safety flyer warns that the smoke can ignite within seconds and that a battery can reignite even after a fire appears to be out.
Honolulu Fire Department safety guidance says residents should not charge e-bikes or e-scooters indoors, should use only approved chargers and should evacuate and call 911 if a battery fire starts. The advice is especially relevant in mixed-use buildings, where a fire that begins in a commercial storage area can quickly threaten neighboring spaces.
Oahu Has Seen Other Battery Fires This Year
The downtown blaze is part of a growing string of lithium-ion battery incidents on Oahu. In January, HFD said an e-scooter battery caused a McCully house fire that produced an estimated $248,000 in damage, while a May e-bike battery fire at a Mililani apartment building displaced two residents and prompted a second-alarm response with a hazardous-materials unit, according to HFD records and Hawaii News Now.
No injuries were reported in the Kekaulike Street fire, but the final damage estimate shows how quickly a single scooter battery can turn a downtown warehouse into a six-figure emergency. For now, the official finding is accidental, with the investigation pointing to thermal runaway as the trigger.
