Ryanair and international power-bank rules checked on 29 August 2026. Airline policy can change, and the printed Wh rating on your own device is more reliable than a generic capacity estimate.
Quick answer
A typical 20,000mAh power bank rated at a nominal 3.7V is about 74Wh, so it falls below Ryanair’s current 100Wh ceiling. That does not make every “20K” model automatically acceptable. Check the printed Wh label, carry no more than two power banks, protect each one against short circuit, and keep it on your person or in the small cabin bag under the seat—not in an overhead locker.
Ryanair’s 2026 decision at a glance
| Check | Current Ryanair rule |
|---|---|
| Typical 20,000mAh at 3.7V | About 74Wh; below the 100Wh ceiling |
| Maximum quantity | Two power banks per passenger |
| Where to pack | On your person or in the under-seat cabin bag |
| Overhead locker | Not permitted |
| Recharge the bank onboard | Not permitted |
| Use it to charge a device | Permitted except during taxi, take-off, landing, or when crew instructs otherwise |
How 20,000mAh becomes about 74Wh
Airlines regulate lithium-ion batteries by watt-hours rather than the marketing number in milliamp-hours. When a label gives 20,000mAh and a nominal cell voltage of 3.7V, the planning calculation is:
20,000 × 3.7 ÷ 1,000 = 74Wh
Use that calculation only when the device does not provide a Wh rating. The printed or manufacturer-specified Wh value wins. Do not substitute a USB output such as 5V when the label provides a different nominal battery voltage. If the label is missing, illegible or internally inconsistent, bring the manufacturer’s specification or choose a clearly marked bank.
Where Ryanair requires you to keep it
Ryanair’s current permitted-items page is more specific than a generic “cabin only” answer. A power bank must be carried on the passenger’s person or in the under-seat cabin bag stowed under the seat in front. It cannot be placed in a cabin bag stored in the overhead locker. If staff take a cabin bag at the gate for loading into the hold, remove the power bank before handing the bag over.
Protect each bank against short circuit. Ryanair lists original retail packaging, insulating exposed terminals with tape, or placing each battery in a separate plastic bag or protective pouch as acceptable methods. Do not travel with a bank that is swollen, leaking, cracked, overheating or subject to a confirmed recall.
Can you use it during the Ryanair flight?
Ryanair separates two actions. You must not recharge the power bank itself at any time onboard. You may currently use it to charge a personal electronic device, except during taxi, take-off and landing or whenever the crew instructs otherwise. Crew instructions always take priority. This carrier-specific distinction is why the broader Ryanair versus easyJet onboard-use comparison has a different answer for each airline.
What can still make a 20,000mAh bank fail the check?
- The printed rating is above 100Wh. A product name or advertised mAh figure does not override the label.
- You carry more than two. Ryanair’s specific power-bank limit is two per passenger.
- The bank is in checked baggage or an overhead locker. Move it to your person or under-seat bag.
- The terminals are unprotected. Pack each bank so metal objects cannot bridge the contacts.
- The device is damaged or recalled. Capacity compliance does not make an unsafe bank suitable for flight.
- Your itinerary uses another operating airline. Check every carrier and follow the strictest applicable rule.
Before you leave for the airport
- Read the physical Wh label and model number.
- Count all power banks you are carrying.
- Protect the terminals or use separate pouches.
- Place them on your person or in the under-seat cabin bag.
- Check every operating airline on connections or codeshares.
- Open Ryanair’s current rule again if your flight is later than this source-check date.
Summary
A normal 20,000mAh/3.7V power bank is approximately 74Wh and therefore below Ryanair’s current 100Wh ceiling. Approval still depends on the actual label, condition, quantity and packing. Keep no more than two on your person or under the seat, never in the hold or overhead locker, never recharge the bank onboard, and follow the phase-of-flight and crew limits when charging another device.
Official sources
- Ryanair: What items are permitted on board?
- Ryanair general terms and conditions
- ICAO: 2026 power-bank restrictions
- IATA 2026 passenger lithium-battery guidance
Source check: 29 August 2026. Airline rules can change without notice; the operating carrier and crew make the final decision.