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The Federal Aviation Administration (FAA) has issued a renewed safety alert warning airlines about the ongoing risks posed by lithium batteries carried onboard by passengers and crew. These batteries, found in common devices such as cell phones, laptops, portable power banks, e-cigarettes, and hearing aids, carry the potential to malfunction and ignite fires through a phenomenon known as "thermal runaway."
According to the FAA, lithium batteries stored in passenger overhead bins or inside carry-on bags are particularly hazardous because they can be hidden, hard to access, and difficult to monitor. This obscurity can delay the detection of overheating or fire, increasing danger during flight. The alert warns that firefighting efforts may also be hampered if the battery is not easily reachable.
The warning follows a recent on-camera demonstration for CNN by the FAA, showing how quickly a thermal runaway in a battery power pack stowed in a seat-back pocket can erupt, showering sparks and igniting flames. While Halon fire extinguishers can temporarily suppress flames, they do not stop the dangerous runaway reaction, which requires large volumes of water to cool and extinguish effectively.
Through August 2025, the FAA has documented 50 verified incidents involving battery-related fires or malfunctions on aircraft, highlighting the persistent nature of this threat. Airlines are urged to rethink how lithium batteries are stored, especially discouraging their placement in areas that are not visible or easy to reach during the flight, such as overhead bins or packed carry-on compartments.
Among major U.S. carriers, Southwest Airlines stands out for its policy requiring portable chargers and power banks to remain in plain sight when in use onboard to help mitigate risks.
Passenger safety guidelines continue to prohibit spare lithium batteries in checked luggage altogether, signaling the FAA's commitment to reducing fire hazards linked to these powerful but potentially dangerous power sources.
As air travel grows busier and device use more prevalent, this FAA safety alert serves as a crucial reminder for airlines and passengers alike to remain vigilant about the risks of lithium batteries in the skies.