Power Bank Rules for Flying in 2026: mAh to Wh and Limits
Power banks on planes in 2026: carry-on only, the 100 Wh and 160 Wh limits, how to turn mAh into Wh, and which airlines cap the number or ban using them.
Power banks used to be the easy part of packing. Toss it in your bag, done.
Not anymore. In 2026 a lot changed: a new global rule capping how many you can bring, airlines banning their use during the flight, and some airports actually counting them at security. Travelers on Reddit are confused, and honestly, fair enough. The rules now depend on the airline, and sometimes the airport.
Here's what's the same everywhere, what changed, and how to check your own power bank in about ten seconds.
Short version: power banks go in your carry-on, never in checked bags. Up to 100 Wh is fine. 101–160 Wh needs the airline's OK (and some airlines say no). Over 160 Wh can't fly. Most airlines now allow two at most (Southwest and Emirates allow one), and many don't let you use or charge them in flight. A typical 20,000 mAh power bank is about 74 Wh. Check yours with the power bank checker.
The rules that apply everywhere
These come from the dangerous goods rules airlines follow worldwide. The US version is on the FAA's PackSafe page:
- Carry-on only. Spare lithium batteries, including power banks and phone battery cases, can't go in checked bags.
- Up to 100 Wh per battery: allowed.
- 101 to 160 Wh: only with airline approval, and no more than two of these larger spares.
- Over 160 Wh: not allowed as a spare battery on a passenger plane.
- Protect the terminals. Keep it in its retail pack, a pouch, or a separate bag so the contacts can't touch metal.
- If your carry-on is checked at the gate, take the power bank out and keep it with you in the cabin.
The FAA also says plainly that many airlines have stricter limits on how many power banks you can bring, whatever their size. That's the part that changed the most this year.
What changed in 2026
On 27 March 2026, ICAO (the UN aviation agency) added new power bank rules to the international dangerous goods instructions. The UK Civil Aviation Authority summarizes them like this. Power banks:
- must be carried in carry-on baggage
- must be individually protected when not in use
- must not be recharged on board
- should not be used to charge other devices on board
- maximum of two per person
The industry rulebook (IATA's Dangerous Goods Regulations) picks these changes up in its next edition, from 1 January 2027. Plenty of airlines didn't wait, and some went further. Southwest and Emirates cap it at one.
So the realistic 2026 picture: bring one or two power banks, keep them out of the overhead bin, and assume you can't use them in the air unless your airline says you can.
mAh to Wh: the only maths you need
Power banks are usually labeled in mAh. The rules are in Wh. Here's the conversion:
Wh = mAh × V ÷ 1000
Use the battery's own voltage, which is printed on the label and is almost always 3.6 or 3.7 V. Don't use the 5 V USB output. That's a common slip in forum threads, and it makes your power bank look bigger than it is.
Worked example: a 20,000 mAh power bank at 3.7 V:
20,000 × 3.7 ÷ 1000 = 74 Wh. Well under 100. Fine on every airline that allows power banks.
| Label | Voltage | Watt-hours | Under the safety rules |
|---|---|---|---|
| 5,000 mAh | 3.7 V | 18.5 Wh | Allowed |
| 10,000 mAh | 3.7 V | 37 Wh | Allowed |
| 20,000 mAh | 3.7 V | 74 Wh | Allowed |
| 25,000 mAh | 3.6 V | 90 Wh | Allowed |
| 27,000 mAh | 3.7 V | 99.9 Wh | Allowed, just |
| 40,000 mAh | 3.7 V | 148 Wh | Airline approval needed |
That 27,000 mAh is the practical ceiling for "no questions asked". The big laptop power banks around 25,000 mAh usually print about 90 Wh on the label, which is why they're sold as "flight safe".
Don't want to do the maths? Type your mAh into the power bank checker. It does the conversion and shows which airlines limit how many you can bring.
If the label is worn off, you've got a problem. Security staff need to see a rating. Travelers flying in the Philippines and mainland China describe staff reading the label on every power bank, and people losing ones where the print had rubbed off. A tiny sticker with the Wh written on it doesn't count. If the original label is unreadable, replace the power bank before the trip.
Airline power bank rules we could confirm
These are from each airline's own website, checked in October 2026. "Use in flight" means charging your phone or other devices from the power bank. "Recharge" means plugging the power bank into the seat power.
| Airline | How many | Use in flight | Recharge on board | Notes |
|---|---|---|---|---|
| Southwest | 1 | Yes, if it's visible | No | Max 100 Wh. Not in the overhead bin |
| Delta | 2 | Yes, except taxi, take-off and landing | No | Max 100 Wh each, no exceptions. Not in the overhead bin |
| JetBlue | 2 | No | No | Not in the overhead bin |
| Emirates | 1 | No | No | Under 100 Wh. Not in the overhead bin |
| Singapore Airlines | 2 | No | No | Seat pocket or under the seat |
| Cathay Pacific | 2 | No | No | Never in the overhead bin |
| Qantas | 2 | No | No, including seat USB | Up to 160 Wh each, 100–160 Wh with approval |
| Virgin Australia | 2 | No | No | Up to 160 Wh each, 100–160 Wh with approval |
| AirAsia | — | No | No | Max 100 Wh without approval. Seat pocket or under the seat |
| Ryanair | 2 | Yes, except taxi, take-off and landing | No | Max 100 Wh. Not in the overhead bin |
| easyJet | 2 | No | No | Up to 160 Wh |
| Vietnam Airlines | 2 | No | No | Keep it in the seat pocket or next to you |
| China Airlines | 2 | No | No | Max 100 Wh |
| ANA | 2 | No | No | Up to 160 Wh |
| Thai Airways | 2 | No | — | Max 100 Wh |
A dash means the airline's page doesn't give a clear answer.
A few others announced restrictions this year too (Korean Air bans using and charging power banks on board and keeping them in the overhead bin, for example), but we couldn't confirm every detail on the airline's own pages. For American, United, Alaska, Qatar Airways, Lufthansa, British Airways, Turkish Airlines, Air France, KLM and Jetstar, we couldn't load the official page when we checked. Look at the airline's own "dangerous goods" or "restricted items" page before you fly. Rules here are changing every few months.
Notice the split on the 100–160 Wh range. The safety rules allow it with approval, but Southwest, Delta, Ryanair, Emirates and China Airlines simply cap power banks at 100 Wh. If yours is between 100 and 160 Wh, you need to ask the airline, and some will say no.
Where to keep it on the plane
This one's almost universal now: not in the overhead bin. If a battery starts to overheat up there, nobody sees it until there's smoke.
Keep it in the seat pocket, in your personal item under the seat in front, or on you. Southwest says it must be visible while you're using it, not buried in a bag.
Airport security can be stricter than the airline
The airline's rule isn't the only one. A few airports check at security:
- Singapore. Singapore Airlines' page says the two-power-bank limit applies from 15 April 2026. People flying out of Changi say extras were taken at the checkpoint.
- Hong Kong. Cathay Pacific's page warns that airport security at Hong Kong takes extra power banks.
- Mainland China. Travelers on domestic flights in China report power banks without China's CCC safety mark being confiscated. If your trip has a domestic leg inside China, check the current rule before you go.
"But who's going to count them?"
That's the most common reaction on Reddit, especially to Southwest's one-power-bank rule. In plenty of places, honestly, nobody counts. US security screening isn't checking airline policies.
But that's not the whole picture. Some airports do count. Crew make announcements and some walk the aisle, and travelers have seen flight attendants on airlines like Turkish politely but firmly stop people charging. And if something does go wrong with your battery, you don't want to be the person who broke the rule.
The easy fix is to own fewer, better power banks. One 20,000 mAh from a known brand covers a phone two or three times over and fits every airline's rules on size.
Buying a power bank for travel
- Under 100 Wh, with the Wh printed clearly on the case. A 10,000 or 20,000 mAh model is enough for most people.
- A known brand. The new rules exist because of cheap batteries catching fire. Firefighters and electricians in those threads say the same: don't buy the no-name one.
- Check for recalls. Air Canada, for example, names specific recalled power bank models it won't carry, and Virgin Australia bans recalled models too.
- Don't take five small ones. With a cap of two (or one), one good mid-size power bank beats a pile of tiny ones.
Weighing your carry-on for a 7 kg airline? A 20,000 mAh power bank adds roughly 350–450 g. The carry-on weight calculator includes it.
Mistakes people make
- Packing it in checked luggage, or in a carry-on that then gets gate-checked without taking it out.
- Using 5 V in the maths and thinking a 20,000 mAh bank is 100 Wh.
- A worn or missing label. No rating, no flight.
- Bringing three or four because "nobody checks". Sometimes they do.
- Putting it in the overhead bin.
- Plugging it into the seat USB to top it up. That's banned on most airlines now.
- Assuming the rules on the outbound flight are the same on the airline you're flying home.
Frequently asked questions
How many Wh is a 20,000 mAh power bank?
About 74 Wh. Multiply 20,000 by the 3.7 V cell voltage and divide by 1,000. That's under 100 Wh, so it's allowed in your carry-on without airline approval.
Can I bring two power banks on a plane?
On most airlines, yes, two is the new maximum. Southwest and Emirates allow only one. Each one also has to meet the Wh limits.
Can I use my power bank during the flight?
It depends on the airline. Delta and Ryanair allow it except during taxi, take-off and landing, and Southwest allows it if the power bank stays visible. JetBlue, Emirates, Singapore Airlines, Cathay Pacific, Qantas, AirAsia, easyJet and others ban using it on board. Recharging the power bank from seat power is banned almost everywhere.
Can I put a power bank in my checked bag?
No. Power banks and spare lithium batteries must always travel in the cabin. If your carry-on gets checked at the gate, take the power bank out first.
Is a 27,000 mAh power bank allowed on planes?
At 3.7 V it's about 99.9 Wh, so it's just under the 100 Wh limit. Make sure the Wh rating is printed on it. Anything bigger is above 100 Wh and needs airline approval, and some airlines don't allow it at all.
What about a 40,000 mAh power bank?
At 3.7 V that's about 148 Wh. It needs the airline's approval, and Southwest, Delta, Ryanair, Emirates and some others cap power banks at 100 Wh, so it isn't allowed on those airlines at all.
Why can't power banks go in the overhead bin?
If a lithium battery overheats, crew need to see it and deal with it fast. In a closed bin, nobody notices until there's smoke. Most airlines now want them in the seat pocket, under the seat or on you.
