The FAA rules on lithium batteries are strict and confusing. We tested the best portable chargers that actually comply with airline regulations while delivering enough power for long international flights.
Understanding FAA Lithium Battery Rules
Spare lithium batteries must be carried in carry-on baggage, not checked bags. Batteries over 100Wh require airline approval. Most power banks are rated at 3.7V which means the 100Wh calculation uses a different formula than most travelers realize.
The 100Wh vs mAh Confusion
To calculate Wh: (mAh x 3.7V) / 1000. A 20000mAh power bank is 74Wh – well under the 100Wh limit. A 26800mAh is 99Wh – still under 100Wh. Above 26800mAh at 3.7V starts requiring airline approval.
Charging Speed Matters on Planes
Most planes have limited USB ports with 5W or 10W output. Bring a power bank with pass-through charging so you can charge both your power bank and devices simultaneously from those slow in-seat ports.
Best Strategy for Long International Flights
Bring two smaller power banks instead of one large one. A 10000mAh for your main device and a second for backup keeps you under the 100Wh limit while ensuring you never run out of power during a 15-hour flight.
Top Picks: Best Portable Chargers in 2026
After hands-on testing, these are our recommended Portable Chargers for 2026:
- Portable Charger 10000mAh
- INIU 20000mAh 65W Power Bank
- Anker 25000mAh 165W Power Bank
- WOLFBOX MegaFlow Air Duster
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Frequently Asked Questions
Can I bring a 20000mAh power bank on a plane?
Yes, a 20000mAh power bank at 3.7V is 74Wh, well under the 100Wh FAA limit. You can bring it in your carry-on bag with no approval needed.
How many power banks can I bring on a plane?
There is no strict limit on the number of power banks, but airline security officers may question carrying multiple large-capacity batteries. Carry them in your carry-on, not checked baggage.
Do I need to turn off my power bank during flight?
Most airlines require power banks to be turned off or placed in sleep mode during takeoff and landing. During the flight, they can remain on in your bag unless the airline specifically requires otherwise.