Flying With a Power Bank: Battery Rules Explained
Quick answer
Power banks and spare lithium batteries must go in your cabin baggage, never in checked luggage. Most airlines allow banks up to 100 Wh without special approval, and larger ones up to 160 Wh only with airline permission and usually in limited numbers. Always check your airline’s current policy, because several carriers have added their own limits on use and quantity.
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Why the rules exist
Lithium-ion batteries store a lot of energy in a small space. If one is damaged, defective or short-circuited, it can overheat and ignite, an event known as thermal runaway. In the cabin, a crew member can spot smoke and act fast. In the hold, no one is there. That is the reason behind the core rule: spare batteries and power banks travel with you in the cabin.
The main rules in plain language
| Item | Typical rule |
|---|---|
| Power banks and spare batteries | Carry-on only, never checked |
| Up to 100 Wh | Usually allowed without approval |
| Over 100 Wh up to 160 Wh | Usually needs airline approval, limited quantity |
| Over 160 Wh | Generally not permitted on passenger flights |
| Loose batteries | Protect terminals, for example with tape or a case |
These limits reflect widely used international dangerous-goods guidance, but airlines and national regulators can be stricter. The airline’s own page always wins, so check it before you fly and print or screenshot it if your device is near a limit.
How to work out watt-hours
Many modern power banks print the Wh rating on the case. If yours only lists milliamp-hours (mAh) and a voltage, use this simple formula: Wh = (mAh ÷ 1,000) × volts. Most banks use cells rated at 3.6 or 3.7 volts, so a 20,000 mAh bank is roughly 74 Wh. Note that the mAh printed on the case is often the cell capacity, not the output you would see when charging over USB, so the label may quote both. If you cannot find a rating, expect questions at security.
- 10,000 mAh at 3.7 V is about 37 Wh.
- 20,000 mAh at 3.7 V is about 74 Wh.
- 27,000 mAh at 3.7 V is about 100 Wh, right at the usual limit.
Using a power bank in flight
This is the area where rules have been changing. Some airlines now restrict or prohibit charging devices from a power bank in flight, or require that the bank stays visible and not stowed in an overhead locker. Others still allow use in the seat area. Because policies differ by carrier, read yours before the trip rather than relying on what happened on your last flight.
Packing tips that prevent problems
- Keep each bank in a pocket, bag or case where the terminals cannot touch metal objects like keys or coins.
- Do not fly with a swollen, dented, hot or leaking battery. Replace it.
- Buy from reputable brands with clear labels and safety certifications.
- Pack it in an easy-to-reach place so you can show the label at security.
- Do not put a power bank in a bag you may be asked to gate-check without removing it first.
That last one catches people out. If your cabin bag is forced into the hold because the overhead bins are full, remove your power bank and other spare batteries first and keep them with you. Our guide to the personal item packing guide shows a smart way to arrange your under-seat bag so electronics stay accessible.
Devices with built-in batteries
Laptops, phones, cameras and tablets contain lithium batteries too. These are usually fine in the cabin and often allowed in checked bags if fully switched off and protected, but airlines prefer them in the cabin, and a device in a checked bag should never be in sleep mode. Larger items such as e-bike batteries and hoverboards are heavily restricted, and many carriers refuse them entirely. Check before buying a ticket if you plan to bring one.
If security questions your power bank
Stay calm and show the label. If the rating is unclear or too high, staff may ask you to leave it behind. It is far cheaper to replace a power bank than to miss a flight, so avoid arguing. Arriving early helps, and our airport security tips cover how to get through the checkpoint smoothly.
Before you go
Charge your bank and devices before you leave. Long flights are easier when your phone is full and your boarding pass is downloaded. When you are ready to book, compare popular routes on ScanFlyGo and remember that your flight can be followed on the live flight tracker.
Frequently asked questions
Can I put a power bank in my checked bag?
No. Spare lithium batteries, including power banks, are generally required to be in carry-on baggage so crew can respond quickly if one overheats. Devices with built-in batteries may have different rules, so check with your airline.
How do I know my power bank’s watt-hours?
Look for a Wh figure on the label. If it only shows mAh and volts, multiply mAh by volts and divide by 1,000. A 10,000 mAh bank at 3.7 V is about 37 Wh.
Can I use my power bank during the flight?
It depends on the airline. Some restrict or ban using or charging a power bank in flight, so check the policy before you travel and keep it visible and not covered.
How many power banks can I bring?
Rules vary. Many airlines allow a small number, commonly two, of larger banks and more of smaller ones. Confirm with your airline and any local aviation authority guidance.
The bottom line
The safe approach is simple: power banks in your cabin bag, under the watt-hour limit shown on the label, protected from short circuits, and used in line with your airline’s policy. Check the airline’s rules before you travel, since they change. Compare flights on ScanFlyGo when you are ready to plan your next trip.
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