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SESK: Stuff Everyone Should Know · sesk.info/trav-spare-lithium-carry-on-only

Where must spare lithium batteries and power banks go on an airplane?

In your carry-on, not checked bags.

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  1. Checked baggage only
  2. In your carry-on only ✔
  3. Either one, no limit

Why: Spare lithium batteries, including power banks and portable chargers, must be in carry-on bags. A fire in the cabin can be noticed and handled quickly.

Huh, didn't know that: Lithium-ion batteries can overheat in a process called thermal runaway, sometimes without warning.

The dad joke
My power bank travels in first class. It's carry-on and proud.
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References

Answer: In your carry-on only. Spare lithium batteries, including power banks and portable chargers, must be in carry-on bags. A fire in the cabin can be noticed and handled quickly.

  1. FAA: Airline passengers and batteries www.faa.gov/hazmat/packsafe/airline-passengers-and-batteries
    Spare lithium batteries (including power banks and portable chargers) must be carried on and cannot be checked.
    Checked 2026-10-11.

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