Power bank rules on flights tightened during 2026, and the part that catches people is not the capacity limit, which has barely moved. It is the newer restrictions on how many you may carry and whether you may use one in your seat.
The stable part first. Power banks go in your carry-on, never in checked baggage, on every airline. The widely used capacity bands are unchanged: under 100 watt hours is generally fine, 100 to 160 watt hours usually needs airline approval, and above 160 watt hours is refused. If your bank prints milliamp hours and not watt hours, divide the mAh by 1000 and multiply by 3.7. A 20,000 mAh bank is about 74 watt hours, comfortably inside the limit.
What changed during 2026, according to multiple travel and industry sources rather than one official page:
A limit of roughly two spare banks per passenger has been reported widely, attributed variously to international air transport guidance and to individual carriers adopting it.
Charging a power bank from an in-seat USB port or socket is now prohibited by a growing number of airlines, in some cases for the whole flight.
Several carriers, concentrated in Europe and Asia, have gone further and banned using a power bank at all in flight, not only recharging it.
At least one large US carrier stopped allowing power banks to be stowed in the overhead bin, requiring them to stay where you can see them.
The sources for all of that are travel press and airline notices rather than one global rulebook, and they disagree on the details, which is exactly why this is worth five minutes before a trip rather than an assumption.
So, practically. Take one or two banks, not four. Keep them in the seat pocket or your lap, not in the bin and not in a bag overhead. Charge them at the hotel, not on the aircraft. Label the capacity if the printing has worn off, because a bank with no readable rating is the one that gets taken off you.
And check your specific airline's page the week you fly. This is a rule set that changed three times in eighteen months, and the carrier's own page is the only version that counts at the gate.
