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01The rules, in plain English
Every airport and airline we know of lets you fly with a normal phone power bank. The catch is where you pack it and how big it is.
Power banks are spare lithium-ion batteries. If one shorts out or overheats in the cargo hold, nobody can see it or reach it. In the cabin, crew can spot smoke within seconds and deal with it. That one fact explains almost every rule below.
| Battery size | Carry-on | Checked bag | Notes |
|---|---|---|---|
| Up to 100 Wh | Allowed | Never | Two per person under 2026 ICAO rules |
| 101–160 Wh | Airline approval, often refused | Never | TSA still lists it; IATA now advises against |
| Over 160 Wh | Not allowed | Never | Can't fly as passenger baggage |
If a gate agent asks to check your carry-on at the last minute, take the power bank out first. This is the mistake that gets most bags pulled aside.
02What changed in March 2026
On 27 March 2026, the International Civil Aviation Organization (ICAO) added tighter power bank rules to the global dangerous goods standard that airlines follow. IATA, the airline trade body, published guidance for carriers the same week. The headline changes:
- Two power banks per passenger. There used to be no single global number.
- No recharging the power bank on board. Don't plug it into the seat USB port.
- Using it to charge your phone mid-flight is discouraged. The guidance says power banks shouldn't be used to charge devices on board. Some airlines treat that as a hard ban.
- Keep it protected from short circuits. A case, pouch or taped-over ports all count.
Several airlines got there first. Qantas and Virgin Australia stopped passengers from using or charging power banks on board from December 2025, and the Lufthansa Group followed in January 2026. More Asian and Middle Eastern carriers have similar bans. If you're flying an international airline, assume you can carry the bank but not use it until you land.
The TSA's published rules haven't caught up with the new limits. You'll still see 101–160 Wh banks listed as allowed with airline approval. In practice, US airlines can be stricter than the TSA, and international legs follow the ICAO standard. Sticking to 100 Wh or less and two banks keeps you legal everywhere.
03mAh vs Wh: find your number
Airlines care about watt-hours (Wh). Most power banks advertise milliamp-hours (mAh). To convert, you need the battery's cell voltage, which is almost always 3.6 or 3.7 volts for the lithium cells inside a power bank.
Wh = mAh × volts ÷ 1,000So a 20,000 mAh bank at 3.7 V is 20,000 × 3.7 ÷ 1,000 = 74 Wh.
Check the label on the back first. Most reputable banks print the Wh figure directly because airport staff ask for it. If yours only shows mAh, plug the numbers into the checker below.
| Advertised size | Approx. Wh at 3.7 V | Verdict |
|---|---|---|
| 5,000 mAh | 18.5 Wh | Fine |
| 10,000 mAh | 37 Wh | Fine |
| 20,000 mAh | 74 Wh | Fine |
| 26,800 mAh | 99 Wh | Just under the line |
| 30,000 mAh | 111 Wh | Over 100 Wh. Ask first or leave it |
| 50,000 mAh | 185 Wh | Not allowed |
04How to pack it so security doesn't stop you
Security doesn't usually need you to take a power bank out of your bag, but some airports scan electronics separately. Keep it near the top so you can pull it out quickly.
Since you can't top it up on board under the new rules, start full. A 10,000 mAh bank charged at home will refill most phones about twice once you land.
05Which power bank is best for flying?
For most trips, 10,000 to 20,000 mAh is the sweet spot. It's well under the limit, light enough to forget about, and big enough for a full day of maps, photos and boarding passes.
10,000 mAh
- About 37 Wh
- Roughly 2 phone charges
- Pocket-sized
20,000 mAh
- About 74 Wh
- Roughly 3–4 phone charges
- Can top up a tablet too
Magnetic 5,000–10,000 mAh
- 18–37 Wh
- Cable-free charging
- Slower and less efficient than a cable
Every bank here is under 100 Wh, so it's carry-on friendly. Check the Wh label on whichever one you pick.
Not sure how many charges you'll actually get? Our power bank calculator does the math for your phone.
Questions people ask
Can I bring a 20,000 mAh power bank on a plane?
Yes. A 20,000 mAh bank with 3.7 V cells is about 74 Wh, well under the 100 Wh limit. Pack it in your carry-on.
Is a 30,000 mAh power bank allowed on planes?
It's borderline. At 3.7 V it works out to about 111 Wh, which is over the 100 Wh line. Some US airlines may approve it, but under the 2026 ICAO/IATA guidance many carriers won't. If you fly often, a 20,000 mAh bank is the safer buy.
Can I use my power bank during the flight?
It depends on the airline. The 2026 global rules say you can't recharge the power bank itself on board and advise against using it to charge devices. Qantas, Virgin Australia and the Lufthansa Group, among others, ban using it entirely. Check your airline's page before you board.
How many power banks can I take?
Two per passenger under the ICAO rules that took effect on 27 March 2026. Some airlines set their own, stricter limits.
Why can't power banks go in checked luggage?
A lithium battery that overheats in the hold can start a fire that nobody can see or reach. In the cabin, crew can spot it and contain it quickly.
Does a power bank built into a phone case count?
Yes. Battery cases and MagSafe-style battery packs are power banks as far as airlines are concerned. They follow the same carry-on and Wh rules.