Airline-Safe Power Banks: Carry-On Rules Explained

Quick answer: Pack your power bank in your carry-on — never in checked baggage. For most travelers, choose a bank at or under 100 watt-hours (Wh). That size is allowed in the cabin under FAA and TSA rules without special airline approval. Banks from 101–160 Wh need airline approval and are limited to two spares. Anything over 160 Wh is not allowed for passengers. In 2025 and 2026, many airlines added stricter rules: limits of one or two banks, bans on overhead stowage, and, on some carriers, bans on using or charging them in flight. Always check your airline before you fly.

Boarding passes, hotel maps, and two-factor codes all live on your phone. A dead battery turns a simple travel day into a scramble. As a pilot and flight instructor, I treat spare power the way I treat water and a spare pair of socks — planned, not hoped for. The U.S. rules are clear once you know what security and airlines look for: watt-hours, not the big milliamp-hour number on the box.

Carry-on only — never checked

Under FAA PackSafe and TSA rules, a power bank is a spare lithium-ion battery. That means:

• It must travel in your carry-on (or on your person).
• It is not allowed in checked baggage.
• If a gate agent asks you to check a bag with a power bank inside, pull the bank out and keep it with you in the cabin.

Flight crews are trained to handle a lithium battery fire in the cabin. In the cargo hold, a fire is much harder to catch early. That is why spare batteries and portable chargers stay upstairs with you.

Official sources: FAA — Airline Passengers and Batteries, FAA PackSafe — Lithium Batteries, TSA — Power Banks.

The number that matters: watt-hours (Wh)

Airlines and security care about watt-hours, not the marketing mAh figure.

How to calculate Wh (from the FAA):

• If the label shows volts (V) and amp-hours (Ah): Wh = V × Ah
• If you only have milliamp-hours (mAh): Ah = mAh ÷ 1,000, then multiply by volts
• Most USB power banks use about 3.7 V, so: Wh ≈ (mAh × 3.7) ÷ 1,000

Examples with the 3.7 V rule of thumb:

• 10,000 mAh ≈ 37 Wh
• 20,000 mAh ≈ 74 Wh — still under 100 Wh
• 27,000 mAh ≈ 100 Wh — right at the common limit; read the printed Wh
• 30,000 mAh ≈ 111 Wh — over 100 Wh; needs airline approval

Before you buy or pack, look for a Wh rating printed on the case. If it is missing, calculate it or skip that model. Airlines increasingly refuse unlabeled banks.

FAA size bands (spare lithium-ion / power banks)

Protect terminals from short circuits (original packaging, a sleeve, or tape over the contacts). Do not fly with a damaged, swollen, or recalled bank.

What airlines changed in 2025–2026

FAA and TSA set the floor. Your airline can be stricter — and many now are. A few current examples (re-check before you fly; policies move):

• Southwest: One power bank per customer, ≤100 Wh; cabin only; not in the overhead bin; do not recharge from seat power; keep it visible when in use. (Southwest help)
• American: Up to two chargers, each ≤100 Wh; keep them within reach and visible while in use; not in the overhead bin; do not recharge the bank from seat power. (American restricted items)
• United: Up to two portable chargers; keep them on you or in your personal item; not in the overhead bin; do not recharge from aircraft power. (United electronic devices)
• Delta: Max two power banks, each ≤100 Wh; keep them accessible under the seat or in the seatback pocket; not in the overhead bin; do not recharge onboard; do not use them to charge a device during taxi, takeoff, or landing. (Delta battery rules)
• Emirates: One bank under 100 Wh; no use onboard at all (neither charging devices from it nor charging the bank); store under the seat or in the seat pocket — not the overhead. In effect since 1 October 2025. (Emirates announcement)
• Cathay Pacific: Max two power banks in carry-on; onboard use and recharging not permitted. (Cathay Pacific notice)

When in doubt, charge devices before boarding, keep the bank under the seat, and follow the crew.

What to look for in a travel power bank

You do not need a particular brand. You need a bank that matches the rules and your trip:

1. At or under 100 Wh, with the rating printed clearly on the case
2. USB-C in and out so one cable covers phone and bank
3. A size you will actually pack
4. Intact cells: no swelling, no damage, no recall
5. Enough capacity for your day (often 10,000–20,000 mAh / roughly 37–74 Wh covers phones and earbuds)

Skip unlabeled no-name banks, anything over 160 Wh, and any bank that has been crushed or recalled. For smart luggage, the battery must be removable; non-removable lithium bags get refused under the same family of rules.

How to pack it

• Put the power bank in your personal item or an outer carry-on pocket, not in a checked bag.
• Keep a cable with it.
• Charge it the night before.
• If your airline bans overhead stowage for power banks, leave it under the seat or in the seat pocket for the whole flight.
• If the bank feels hot, expands, smokes, or smells odd, tell the crew immediately.

Common mistakes

• Checking a bag with a power bank still inside
• Buying by mAh alone and ignoring Wh
• Carrying a swollen, damaged, or recalled bank
• Assuming every airline matches the FAA baseline — many now limit you to one or two banks, ban overhead storage, or ban in-flight use
• Recharging a bank from seat power when your airline forbids it

FAQ

Can I bring two power banks?
Under FAA rules, there is no quantity limit for personal-use banks under 100 Wh. Many airlines now cap you at one or two anyway. Check your carrier.

Will TSA let a power bank through?
Yes, when it is an allowed type in carry-on. Expect it to be screened. Keep it easy to pull out if an officer asks.

What about smart-luggage batteries?
Removable batteries only. Remove them before the bag is checked or gate-checked, and carry the battery under the same spare-battery rules.

Can I use my power bank during the flight?
It depends on the airline. Some U.S. carriers allow use if the bank stays visible and within reach. Others (for example Emirates and Cathay Pacific) ban onboard use entirely. Seat-power recharging of the bank itself is widely restricted.

What if my bank is over 100 Wh?
101–160 Wh needs airline approval, and you may bring at most two. Over 160 Wh is not allowed for passengers.

If you want packing lists built for multi-day and international trips, grab free Flight Deck access. The full packing system is in my book, Mastering the Art of Travel.

AJ Weimer is a Gold Seal flight instructor and author of Mastering the Art of Travel.

Keep reading: My Flight Bag Essentials, Bose QuietComfort vs Apple AirPods Max: Which is the travel king? and Mophie 3-in-1 Travel Charger: The Ultimate Travel Charger.