Finnair power bank rules
What Finnair’s own page says about power banks, checked 22 October 2026.
The rules
- Max. 2 power banks per person
- Power banks up to 100 Wh are allowed in carry-on without Finnair’s prior approval
- Power banks over 100 Wh are not permitted at all
- Store under the seat in front or in a seat pocket, preferably not in the overhead bin
- No charging from the aircraft outlet, and no charging your devices from it during the flight (Finnair FAQ: “Can I use power banks during the flight?”)
| Using it on board | Using a power bank to charge your devices during the flight is prohibited |
|---|---|
| Charging the power bank | Charging it from the aircraft’s power outlet is not allowed |
| Where to keep it | Under the seat in front or in a seat pocket, preferably not the overhead bin |
Source: finnair.com, checked 22 October 2026. Rules can change and can differ on codeshare flights, so check with the airline that operates your flight.
Common sizes on Finnair
| Power bank | Wh | One power bank |
|---|---|---|
| 10,000 mAh at 3.7 V | 37.0 Wh | Allowed |
| 20,000 mAh at 3.7 V | 74.0 Wh | Allowed |
| 27,000 mAh at 3.7 V | 99.9 Wh | Allowed |
| 40,000 mAh at 3.7 V | 148.0 Wh | Not allowed |
Wh = mAh ÷ 1000 × V. We show 3.7 V as an example; use the voltage printed on yours. Check yours with the calculator →
Finnair cabin bag size
Packing your hand luggage too? See the Finnair cabin bag size and weight allowance, or check your bag against 36 airlines with the cabin bag checker.
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