Airline passengers are being warned not to pack power banks in their checked luggage ahead of the summer vacation travel period.
Devices with rechargeable batteries, like mobile phones, laptops, tablets and smartwatches, can be plugged into power banks on the go when charging outlets may not be available.
However, power banks are not without danger and are not environmentally friendly.
The warning has come from the U.K.’s Civil Aviation Authority (CAA), which believes that many travelers still aren’t aware of the rules—or the fire risk.
Passengers on U.K. flights must take power banks—and other items containing lithium batteries—with them into the cabin. They must never be used to charge another electronic device while on the plane. Additionally, only two power banks per person are allowed on a flight.
Consider a scenario where you are about to take off on a flight. You have settled into your seat, started using your mobile phone and put it in airplane mode.
All of a sudden, an unusual hissing sound comes from your bag; smoke starts rising, and within seconds, there is a fire inside your luggage.
This happened on a flight between South Korea and Hong Kong in January 2026, when a power bank caught fire in midair. The accident was not rare; hundreds of fires, explosions and other safety incidents involving lithium batteries and power banks have been recorded by the U.S. Federal Aviation Administration (FAA).
The main reason for accidents involving power banks is the lithium-ion battery, the most common type used in them. Lithium-ion batteries tend to overheat, which can trigger a thermal runaway in which the temperature rises rapidly, causing the battery to explode.
Such an explosion can occur for many reasons, including poor design, manufacturing issues and improper use. In 2017, a family in the U.K. woke to smoke filling their home. The cause of the fire was a power bank charger plugged into an electrical outlet. It overheated and set itself ablaze. Their rooms burned down.
From a scientific point of view, the answer is obvious: Heat is the sworn enemy of lithium-ion batteries. Each time you recharge or discharge a power bank, chemical reactions produce heat in the battery.
And if that heat is not properly controlled—whether due to inadequate design or excessive environmental temperature—a thermal runaway occurs (an uncontrolled, self-heating chain reaction).
In 2026, an Australian man left a power bank in his vehicle on a hot day in Mount Nathan, Queensland. The extreme heat caused the battery to explode, starting a fire. Fortunately, no one was injured in the incident.
Electric shocks
Fire and explosions are not the only hazards associated with these gadgets. They can also cause a dangerous electrical shock to users. This is despite the fact that they operate at lower direct-current voltages.
If the power bank becomes faulty due to being dropped, getting wet or manufacturing defects, the circuitry inside may fail. This could cause the device to send a surge of electricity into the user’s body.
In May 2026, a 75-year-old woman in the U.S. died when her power bank exploded while charging it.
China, which manufactures many of the world’s power banks, has seen manufacturers recall hundreds of thousands of devices due to defects. Some of these faults have been blamed on downstream suppliers.
Another alarming trend has been the rise of counterfeit power banks.
I have spent a large part of my career and life caring about the environment and developing eco-friendly technologies, and the widespread use of power banks is a serious concern due to their negative environmental impact. The manufacturing and disposal of power banks may generate large amounts of electronic waste that can pollute soil, water and air.
Moreover, the extraction of lithium and other materials for power-bank production poses environmental and societal risks. For example, lithium mining in Chile’s Atacama Desert has resulted in pollution and friction with Indigenous communities.
As a scientist and professor of engineering, I urge people to be aware of the potential dangers posed by power banks and how these risks can be mitigated. By following precautions, such as charging devices on hard, nonflammable surfaces, we can ensure the safe use of these devices.
In addition, it is vital to understand the importance of responsible innovation and sustainability in ensuring that technologies can be safely developed and deployed.
Your power bank is a powerful tool, but it demands respect. Treat it with the caution it deserves.
Written by Amor Abdelkader, The Conversation
