Lithium battery fires on planes are rising: passenger flights logged 123 reported thermal-runaway incidents in 2025, up 15 percent from 107 in 2024, and portable chargers caused 30 percent of them. A power bank that works perfectly in a hotel room can, in a sealed cabin, produce a fire the aircraft’s own suppression systems cannot put out — because the cell supplies its own oxygen.
The fix is behavioral: buy from a reputable source, check the watt-hour figure, and never fly with a swollen, damaged, or recalled pack.
Your power bank sat in a hotel room outlet overnight and charged your phone without complaint. It will do the same thing on the plane, in your bag, in the air — until the one time it doesn’t.
That gap between “works fine” and “is fine” is where this whole story lives. A lithium-ion cell doesn’t care that it passed every test you’ve ever given it. What changes in a cabin isn’t the battery’s chemistry; it’s the box around it. A sealed, pressurized tube with shared air, limited places to put a burning object, and no way to open a window turns a single failing cell into everyone’s problem.
The numbers have caught up with the physics. Passenger flights logged 123 reported thermal-runaway incidents in 2025, up 15 percent from 107 the year before, and portable chargers — the cheap, unbranded rectangle most travelers toss in a carry-on without a second thought — accounted for 30 percent of them. That makes the power bank the leading cause of onboard battery incidents.
This isn’t a story about bad engineering. It’s a story about an ordinary object that behaves differently once it’s inside a sealed cabin, and about the specific reasons the crew’s tools can’t stop it once it starts.
2025 was a record year for lithium battery incidents on planes
Two datasets track this, and they don’t measure the same thing. The FAA counts aircraft incidents involving smoke, fire, or extreme heat that are known to the agency — 89 in 2024, a record since it began tracking in 2006. UL Standards & Engagement’s TRIP review counts passenger-flight thermal-runaway incidents through a voluntary reporting program: 107 in 2024 and 123 in 2025.
Those two numbers are not a trend line. Adding them together, or reading the jump from 89 to 123 as a single year’s change, produces a figure that doesn’t exist. What both datasets agree on is direction.
The 2025 figure carries the detail that matters most for a traveler: 30 percent of reported passenger-flight events involved portable chargers, according to UL Standards & Engagement. Not a fringe risk, then — the object most likely to be sitting in your seat-back pocket right now.
| Year or period | Count | Scope and source framing | Portable-charger share |
|---|---|---|---|
| 2006-2023 | (unverified) | FAA chart covers smoke, fire, or extreme heat events since 2006; no consistent annual series retrieved. | (unverified) |
| 2024 | 89 | FAA-recorded aircraft incidents involving smoke, fire, or extreme heat; FAA calls its list incomplete. | Not reported in the FAA figure |
| 2024 | 107 | ULSE TRIP passenger-flight thermal-runaway incidents; separate voluntary dataset, not comparable with the FAA’s 89. | Not reported in the cited 2024 figure |
| 2025 | 123 | ULSE TRIP passenger-flight thermal-runaway incidents; broader voluntary reporting program than the FAA list. | 30% of reported passenger-flight incidents |
| Source: Federal Aviation Administration (FAA); UL Standards & Engagement | |||
The FAA describes its own list as incomplete and subject to verification, which is worth remembering before treating any single count as the full picture.
Why “seems fine” is the trap
A claim about altitude often frames this story, and it’s worth being precise about what’s actually verified. Lithium batteries don’t fail because the cabin sits at a lower pressure. They fail because of what the cabin is: sealed, shared, and hard to escape.
A hotel room has a door, a window, and a floor that isn’t moving. A cabin has none of those in the moment that matters. When a cell vents, the gases go into the same air everyone is breathing, and the object is often in a bag, under a seat, or in an overhead bin — out of sight until someone smells it.
That’s the “seems fine, isn’t” pattern in its purest form. The device isn’t defective in any way you could detect. It charged your phone this morning. It will probably charge it tomorrow. The risk isn’t that it’s broken; it’s that a single internal fault — a manufacturing defect, a damaged cell, a short — has nowhere to go in a sealed tube.
Superdeals cover departures from North America, Europe and Australia.
Flight deals most people never see
Air Traveler Club monitors thousands of routes for pricing anomalies that traditional search engines miss. With ATC Superdeals members save up to 80% on each flight vs. regular fares.
Too good to be true? Check it out yourself. It's free.
Delivered weekly. Unsubscribe anytime.
Why the cabin can’t put out a lithium battery fire
This is the part most passengers have never been told, and it’s the reason a battery fire is treated differently from any other fire on board.
A lithium-ion cell in thermal runaway generates its own oxygen as its cathode breaks down. The reaction is self-sustaining and exothermic — it doesn’t need the cabin’s air to keep burning, which is exactly why the standard Halon 1301 suppression systems installed in aircraft cargo holds and engine nacelles can’t stop it. Halon works by disrupting the chemistry of a fire that depends on oxygen. This fire doesn’t.
Cabin crew are trained to cool a runaway cell with water, and that’s the right first move for a single cell that has just started venting. But once the reaction is underway, water can’t halt it. It can only buy time.
Meanwhile the pack is releasing hydrogen, methane, and carbon monoxide — flammable, toxic, and fast to fill a sealed space. Visibility drops. Breathing gets harder. The fire is the emergency; the air is the second one.
What actually happens inside the cell
Thermal runaway starts small. A short, a defect, or physical damage heats one cell past the point where its internal chemistry becomes self-driving. Temperatures inside that single cell can pass 500 to 800 degrees Celsius — hot enough to ignite the cell next to it, then the one after that, until the whole pack is involved.
In 2016, a V Air crew faced exactly this when a passenger’s power bank began smoking at 35,000 feet. They diverted back toward Taoyuan, cooled the device in a water-filled bin, and landed safely. No one was hurt and the aircraft wasn’t substantially damaged. Investigators could not rule out an internal defect, but the protection board and two cells had burned, leaving the precise cause impossible to determine.
That’s the honest shape of the hazard: early detection and cooling work, and the reason they work is that the crew got to the cell before the reaction spread. Once it’s cell-to-cell, the tools run out.
What to actually do with your power bank
The practical checklist is short, and none of it is exotic. Stick to packs sold by the manufacturer itself or a well-known retailer. Check the watt-hour figure printed on the device — that’s the number airlines actually care about. EASA‘s own guidance echoes that advice, pointing passengers toward original sellers and away from untrustworthy sources.
Then the disqualifiers: a pack that arrives swollen, runs hot, is damaged, has been recalled, or can’t be traced back to a manufacturer shouldn’t fly. A printed safety mark proves nothing by itself — certification marks get counterfeited too.
Here’s the gap worth knowing about. No public dataset breaks down how many incidents involve counterfeit or unbranded chargers versus name-brand ones. ULSE’s report notes that some chargers contain uncertified or counterfeit cells, but it stops short of quantifying how many incidents trace to them. That absence is a finding, not an oversight — the data doesn’t exist publicly, and anyone who tells you otherwise is guessing.
Two more open questions, flagged honestly: no validated study has measured whether cabin ventilation changes how toxic gases spread during a battery fire, and no longitudinal study follows cabin crew for long-term health effects from repeated exposure. Both are real. Both are unresolved.
Reporting by
Key terms
- Thermal runaway
- Thermal runaway is a chain reaction inside a battery cell in which internal heat builds faster than the cell can shed it, until the reaction drives itself. It can begin with a short, a manufacturing defect, or physical damage, and once underway the cell produces its own oxygen through cathode decomposition, making the reaction self-sustaining and exothermic. For lithium batteries shipped as cargo, aviation rules require a 30 percent state of charge — a limit meant to reduce the chemical energy available in transit, precisely because a runaway is so hard to stop once it starts.
- Halon 1301
- Halon 1301 is a fire-suppression agent installed in aircraft cargo holds and engine nacelles. It works by disrupting the chemistry of a fire that depends on oxygen from the surrounding air. That approach fails against a lithium-ion cell in thermal runaway, which supplies its own oxygen — the reason crew training for battery events centers on cooling the cell with water rather than suppressing the fire.
- Watt-hour
- A watt-hour is a unit of energy that measures how much power a battery can deliver over a given period. Airlines care about it more than any other figure on a power bank, which is why the rating is printed on the device itself. For a traveler, that printed number is the one figure worth checking before a pack goes in a carry-on.
- EASA
- EASA is the European Union Aviation Safety Agency, the body that sets and coordinates civil aviation safety rules across Europe. Its guidance on power banks urges passengers to buy from original sellers and warns against untrustworthy sources. Unlike the FAA, which mandates cabin carriage and immediate crew notification, EASA frames its passenger communication and handling measures as advice rather than requirements.
Questions? Answers.
How common are lithium battery fires on planes?
Passenger flights logged 123 reported thermal-runaway incidents in 2025, up 15 percent from 107 in 2024, and portable chargers accounted for 30 percent of those 2025 events. The FAA separately recorded 89 aircraft incidents involving smoke, fire, or extreme heat in 2024 — a record since its tracking began in 2006. The two datasets aren’t directly comparable.
Are lithium-ion batteries a fire risk?
Yes. A cell in thermal runaway produces its own oxygen and can exceed 500 to 800 degrees Celsius, hot enough to spread to neighboring cells in the pack. The FAA logged 89 lithium-battery incidents involving smoke, fire, or extreme heat in 2024, a record since 2006.
Why do batteries overheat on planes?
A short, a defect, or physical damage can push a cell into thermal runaway, a self-sustaining reaction that generates its own oxygen and temperatures above 500 degrees Celsius. In a sealed cabin, the fire also releases hydrogen, methane, and carbon monoxide, which reduce visibility and threaten respiration.
How to put out a lithium-ion battery fire on a plane?
You can’t fully put it out. Cabin crew are trained to cool a runaway cell with water, which helps contain a single cell, but once the reaction is underway water cannot halt it — the cell supplies its own oxygen, so Halon 1301 suppression systems fail against it too.
Do counterfeit or unbranded power banks fail more often than name brands?
No public data answers this. The 2025 figure showing portable chargers caused 30 percent of reported passenger-flight events doesn’t break down by brand, charger design, or counterfeit status, and no study puts a number on how many incidents involve uncertified cells.
How hot can a lithium battery fire get?
Temperatures inside a single lithium-ion cell can surpass 500 to 800 degrees Celsius during thermal runaway, and that heat can spread quickly to neighboring cells in the pack.
