UK aviation officials warn in June that power banks and vapes are now the leading aircraft safety concern for international travellers.

The UK Civil Aviation Authority says badly packed power banks and vapes are now the biggest safety threat to aircraft.
Power banks and vapes are now being described by the UK Civil Aviation Authority as the biggest safety threat to aircraft, with officials warning passengers on 26 June 2026 to pack battery-powered devices correctly. The message is aimed at international travellers carrying portable chargers, e-cigarettes and spare lithium batteries in everyday hand luggage. The risk is not that every device is dangerous, but that damaged, poorly protected or wrongly packed lithium batteries can overheat, smoke or catch fire during a journey.
The CAA’s “pack right for a safe flight” warning focuses on lithium battery items that have become routine travel essentials. Power banks, vapes, camera batteries, drone batteries and spare rechargeable cells all contain stored energy, and that energy can become a hazard if the battery is faulty, crushed, short-circuited or exposed to heat. The authority is not telling travellers to stop carrying these items altogether; instead, it is urging passengers to pack them in the correct bag, protect them from damage and follow airline limits. For most travellers, the key practical change is to think about battery safety before reaching airport security, not while repacking at the gate.
Lithium batteries are widely used because they are light, powerful and rechargeable, but they can enter a dangerous failure state known as thermal runaway if something goes wrong. In simple terms, a damaged or short-circuited battery can heat itself rapidly, release smoke, ignite nearby material or produce flames. In an aircraft cabin, crew can see and respond to smoke or overheating quickly using established safety procedures. In the hold, the same problem is more difficult to spot immediately, which is why spare batteries and portable chargers are normally treated differently from ordinary clothing or toiletries.
As a practical rule, power banks and spare lithium batteries should travel in cabin baggage rather than checked luggage, unless your airline gives a specific alternative instruction. Vapes and e-cigarettes should also be kept out of checked bags and must not be used on board. Loose batteries should never be left rattling around in a pocket with keys, coins or other metal items, because contact with exposed terminals can create a short circuit. Use the original packaging, a dedicated battery case or tape over exposed terminals so each battery is separated and protected.
One of the biggest traveller mistakes is assuming that every portable charger is automatically allowed on every flight. Airlines commonly set limits based on watt-hours, battery capacity and the number of spare batteries a passenger can carry, and these limits may be enforced at security, bag drop or the boarding gate. The rating is often printed on the side of a power bank, sometimes as watt-hours and sometimes as milliamp-hours with voltage. If the marking is missing, unclear or unusually high, airline staff may refuse the item even if you have flown with it before.
International travellers should be especially careful when a trip involves multiple airlines, codeshares or airport transfers. A battery accepted on your first flight may still be questioned on a later sector if the second airline applies a stricter interpretation or if local airport staff cannot verify the capacity. This matters for long-haul trips where passengers often pack large power banks for phones, tablets, headphones and children’s devices. Before departure, check the rules for every airline on the booking, including regional connections and return flights.
If a phone, power bank, vape or other battery-powered item becomes hot, starts smoking, smells unusual or makes a hissing sound during a flight, alert cabin crew immediately. Do not hide the device in a bag, wrap it in clothing or try to solve the problem alone, as this can delay the crew’s response and make the situation worse. Crew are trained to manage battery incidents and will decide how to isolate and cool the device safely. If the issue happens before boarding, tell airport or airline staff rather than putting the item into your luggage and hoping it settles down.
The easiest way to avoid delays is to audit your electronics the night before travel. Remove damaged, swollen or no-name batteries from your bag, check that large power banks show a readable capacity rating and make sure spare cells are individually protected. If you carry specialist equipment such as drones, camera rigs or medical devices, print or save your airline’s battery policy so you can show it if questioned. Travellers should also remember that safety rules override convenience, meaning staff can refuse an item if they cannot confirm it is safe to fly.
The CAA warning on 26 June 2026 does not mean passengers need to travel without modern electronics, but it does mean casual packing is no longer a good idea. Put power banks, vapes and spare batteries in the cabin, protect terminals, check capacity limits and remove anything damaged before you leave home. If your itinerary includes several airlines or countries, verify the strictest rule on the route and pack to that standard. A few minutes of preparation can prevent confiscation, boarding delays and, most importantly, a serious in-flight safety incident.
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