What size power bank is allowed on flights? The quick answer: You can bring a power bank up to 100 watt-hours (Wh) or 27,000 mAh in your carry-on luggage. This is the international safety standard that most airlines follow, so you can pack a compliant device and avoid confiscation at airport security.
The 100 watt-hour rule explained
Aviation authorities like the International Air Transport Association (IATA) set the 100Wh limit as the maximum capacity for lithium-ion batteries carried by passengers. This rule exists because batteries above this threshold pose a greater risk of combustion or explosion in the pressurized cabin environment. Watt-hours measure the total energy a battery can deliver, while milliamp-hours (mAh) measure charge capacity at a specific voltage. Any power bank exceeding 100Wh generally requires airline approval or is banned outright.
Airline-specific power bank rules you must check
Individual airlines may enforce stricter limits on the number or capacity of power banks, so always verify before you fly. For instance, Emirates currently permits only one power bank under 100Wh per passenger, meaning a second bank, even if compliant, could be confiscated. Southwest Airlines requires power banks to be stored in a personal item under the seat in front of you and be visible when in use, prohibiting them from overhead bins. Delta also restricts battery storage to carry-on items under the seat. Some airlines may specify maximum physical dimensions for power banks, meaning a bank within the capacity limit could still be prohibited if it exceeds those dimensions. These examples show that even a 100Wh power bank can cause problems if you ignore the airline's specific rules. Always check your airline's website for its exact policy on power bank usage and selection.
4 critical safety rules for flying with a power bank
- Carry-on only, never check it. Power banks must go in your carry-on baggage. Checked baggage lacks cabin crew oversight, and a lithium-ion battery fire in the cargo hold is far more dangerous. Most airlines outright prohibit power banks in checked luggage.
- Protect terminals from short circuits. Power bank terminals must be individually protected to prevent short circuits. You can tape the terminals, store the bank in its original packaging, or place each bank in a plastic bag or box. A short circuit can cause overheating and fire.
- Do not charge devices during the flight. Power banks must not be recharged using the aircraft's power outlets or used to charge other portable electronic devices during a flight. This rule prevents potential electrical interference and battery stress at altitude.
- This keeps the battery accessible in case of an incident and prevents it from shifting in overhead bins where it could be crushed or forgotten. Power banks should be kept in a protective case or cover to avoid accidental damage during the journey.
Frequently Asked Questions
Can I bring two power banks on a flight?
Most airlines allow multiple power banks as long as each is under 100Wh and the total capacity does not exceed 100Wh per bank. However, some airlines like Emirates limit you to one bank per passenger. Check your airline's policy on quantity before packing multiple units.
What happens if my power bank is over the limit?
If your power bank exceeds 100Wh (or 27,000mAh), security will likely confiscate it. Some airlines may allow you to mail it to yourself or return it to a non-traveling companion, but this is rare. Always confirm your bank's rating before arriving at the airport.
Do I need to declare my power bank at security?
You do not need to verbally declare it, but you must place it in a separate bin during X-ray screening, just like laptops and tablets. Security officers may inspect it if the capacity label is unclear or damaged.
Can I bring a power bank in my checked luggage?
No. Power banks are prohibited in checked baggage on virtually all airlines due to fire risk. Always keep them in your carry-on bag where cabin crew can monitor and respond to any issue.
What if my power bank has no Wh or mAh label?
If the capacity is not clearly marked, security may not allow it through. Check the product manual or manufacturer's website for the rating. If you cannot verify it, leave the power bank at home to avoid confiscation.
Can I use my power bank during the flight?
Yes, you are allowed to use your power bank during the flight, but you must not use it to charge other devices. It is recommended to enable airplane mode on the device being powered to minimize potential interference.
