Airline Power Bank Rules Explained
Power banks are treated as spare lithium batteries for air travel, which means the rules are different from ordinary electronics. The safest starting point is simple: keep the power bank in your cabin baggage, check the watt-hour rating printed on the case, protect it from short circuit and read the rules for the airline actually operating your flight.
Quick answer
For most UK travellers, a power bank at or below 100Wh is the easiest choice. IATA says power banks should not be placed in checked baggage, while the UK CAA says batteries from 100Wh to 160Wh require airline approval and batteries above 160Wh are not permitted in passenger baggage. Airlines can be stricter: Ryanair currently limits power banks to 100Wh, while easyJet states that it accepts power banks up to 160Wh and limits customers to two.
Do not rely on capacity in mAh alone. Airlines and aviation authorities normally regulate lithium-ion batteries by watt-hours (Wh). If the pack has no readable Wh marking, an airline may refuse it even when you think the capacity should be acceptable.
The basic UK and international framework
| Battery rating | General position | What to do |
|---|---|---|
| Up to 100Wh | Generally accepted in cabin baggage under the standard passenger framework | Keep it in the cabin, protect the terminals and check the airline’s own quantity/use rules |
| More than 100Wh up to 160Wh | May be accepted with airline approval under CAA/IATA guidance | Contact the operating airline before travel; some airlines do not accept this range at all |
| Over 160Wh | Not permitted in normal passenger baggage under the standard passenger rules | Do not take it as normal cabin or checked baggage; specialist dangerous-goods transport may be required |
The UK CAA’s Pack Right guidance says 100–160Wh batteries require airline approval and over-160Wh batteries are prohibited in passenger baggage. IATA’s current passenger guidance gives the same broad framework and explicitly says spare batteries and power banks should never be placed in checked baggage.
Power banks go in cabin baggage, not the hold
This is the most important rule to remember. A power bank is not treated like a phone or laptop with a battery installed inside the equipment. It is treated as a spare battery because its purpose is to supply power to other devices.
If your cabin bag is taken from you at the gate and sent to the hold, remove the power bank first and keep it with you in the cabin. The same principle applies to smart luggage: if its battery functions as a power bank and the bag is checked, the battery normally needs to be removable and carried into the cabin.
Airlines can be stricter than the headline 160Wh limit
The aviation framework is not permission to ignore the airline’s own policy. Two UK examples show why.
easyJet
easyJet currently states that power banks are accepted up to 160Wh, must be carried in cabin baggage only, must be individually protected and are limited to two per customer. It also prohibits passengers from using a power bank to charge another device while on board and recommends keeping the bank somewhere it can be monitored rather than buried away.
Ryanair
Ryanair is stricter. Its current terms limit each power bank to 100Wh, with a maximum of two power banks per passenger. It says power banks may not be placed in overhead lockers: they must be on the passenger or in the under-seat cabin bag. Ryanair allows them to charge personal electronics except during taxi, take-off and landing or when the crew instruct otherwise, but the power bank itself must not be recharged in flight.
This is why a 120Wh pack may fit the general CAA/IATA approval framework but still be unsuitable for a particular airline. Always check the operating carrier, not merely the company that sold the ticket.
How to calculate watt-hours
If the Wh figure is not obvious but the manufacturer provides voltage and capacity, the CAA gives this calculation:
Wh = volts × amp-hours
If capacity is shown in milliamp-hours:
Wh = volts × mAh ÷ 1000
Typical examples using a nominal 3.7V cell rating are:
- 10,000mAh ≈ 37Wh
- 20,000mAh ≈ 74Wh
- 25,000mAh ≈ 92.5Wh
- 27,000mAh ≈ 99.9Wh
- 30,000mAh ≈ 111Wh
These examples are only illustrations. Some battery packs use a different nominal cell voltage, so the printed Wh figure or the manufacturer’s official specification is the value to rely on. A large “30,000mAh” marketing number does not automatically tell you whether the pack is flight-compliant.
What size power bank is easiest for flying?
For most travellers, a clearly labelled pack below 100Wh is the least troublesome choice. That usually covers compact 10,000mAh packs and many 20,000–25,000mAh models. The closer a pack gets to the limit, the more important the permanent label becomes.
If you are buying specifically for travel, our Best Power Bank for Phones and Travel guide compares practical phone-first and laptop-capable options. The purchase decision should include the Wh marking, not just USB-C wattage or advertised capacity.
Can you use a power bank during the flight?
There is no universal airline answer. Some airlines prohibit use altogether; others allow it with restrictions. easyJet currently says its power banks must not be used to charge other devices on board. Ryanair allows charging of personal electronics except during taxi, take-off and landing, while also prohibiting recharging the power bank itself.
The practical rule is therefore to board with your phone or tablet sufficiently charged and treat the power bank as a backup, not as something you are guaranteed to be allowed to use throughout the journey.
Where should you store it in the cabin?
Keep the power bank protected from impact, heat and metal objects that could bridge contacts. Original packaging, a separate protective pouch or another method that prevents short circuit is sensible. Some airlines now specifically require or recommend that power banks remain within reach rather than in the overhead locker.
Do not travel with a power bank that is swollen, cracked, recalled, leaking, unusually hot or otherwise damaged. Airlines and IATA guidance do not permit damaged or defective lithium batteries in normal passenger baggage.
What if the Wh rating is missing?
A missing or unreadable battery rating can become a problem at the airport. British Airways’ current smart-baggage guidance, for example, states that a battery/power bank may be refused if its Wh rating cannot be determined. Even where an airline could theoretically calculate the figure from other markings, do not assume staff will be able or willing to do so at the gate.
For a travel power bank, a clear permanent capacity label is therefore part of the product’s usefulness.
Smart luggage and built-in power banks
Smart luggage often contains a removable battery for charging a phone. If the bag is going into the hold, the battery generally needs to be removed and carried in the cabin. If the battery cannot be removed, the bag may be rejected depending on the airline and battery design.
Before buying smart luggage, check whether the battery can be removed without tools and whether the airline you use has additional restrictions. The luggage maker’s claim that a bag is “airline approved” does not replace the operating carrier’s rules.
Practical pre-flight checklist
- Find the Wh rating printed on the power bank.
- Keep the power bank in cabin baggage, not checked baggage.
- If the rating is over 100Wh, check the airline before travelling rather than assuming approval.
- Check the airline’s quantity limit; some restrict travellers to two power banks.
- Protect the pack against short circuit and physical damage.
- Do not pack a recalled, swollen or defective battery.
- If cabin luggage may be gate-checked, remove the power bank first.
- Check whether the airline allows in-flight use and whether overhead storage is permitted.
- Recheck the policy shortly before departure, particularly on multi-airline itineraries.
Frequently asked questions
Can I take a 20,000mAh power bank on a plane?
Usually, if its Wh rating is within the airline’s limit. Many 20,000mAh packs are below 100Wh, but check the actual Wh label because voltage and design vary.
Can I take a 30,000mAh power bank?
Do not decide from mAh alone. At a nominal 3.7V, 30,000mAh is about 111Wh, which falls into the 100–160Wh approval range under the general CAA/IATA framework and exceeds Ryanair’s current 100Wh limit.
Can a power bank go in checked luggage?
No under the normal passenger framework. IATA says power banks and other spare lithium batteries must be carried in the cabin.
Can I have more than one power bank?
Often yes, but quantity rules vary. easyJet currently permits a maximum of two power banks, and Ryanair also limits power banks to two per passenger.
Is a 100W USB-C power bank the same as a 100Wh power bank?
No. Watts describe charging power; watt-hours describe battery energy capacity. A pack can support 100W USB-C output while still containing less than 100Wh of energy.
Can I charge my phone from a power bank on the plane?
It depends on the airline. easyJet currently prohibits use of power banks to charge devices in flight, while Ryanair permits it outside taxi, take-off and landing unless crew instruct otherwise.
Primary sources checked
- UK Civil Aviation Authority — Pack Right battery guidance
- IATA — Safe Travel with Lithium Batteries
- easyJet — Dangerous Goods & Prohibited Articles
- Ryanair — Terms and Conditions / battery carriage rules
- British Airways — Restricted and prohibited items
Final advice
If you want the least complicated option for air travel, choose a reputable, clearly labelled power bank below 100Wh and keep it in your cabin bag. Treat 100–160Wh products as specialist travel items that need an airline-specific check, and do not assume that a generic aviation limit overrides a stricter carrier rule.
For product choices, continue with our travel power-bank buying guide, laptop power-bank guide and travel chargers and adapters guide.
