Lithium-Ion Battery Safety
Portable power banks typically contain lithium-ion batteries, which can overheat and, in rare cases, catch fire if damaged or faulty. Airlines impose safety rules on the carriage and use of such devices, and passengers should follow their carrier’s instructions.
According to the Federal Aviation Administration (FAA), items containing lithium-ion batteries should be kept accessible in carry-on baggage. The FAA notes that damaged, defective, or recalled lithium batteries cannot be taken on a flight, in either carry-on or checked baggage. The FAA’s best advice for traveling with a lithium-ion battery is: “When in doubt, leave it out.”