Power Bank Rules on Planes in 2026: Watt-Hours and Airline Limits
How many power banks can you bring on a plane in 2026? Convert mAh to watt-hours, see the under-100Wh rules, and the airline-by-airline limits explained.
You bought a power bank, you’re flying soon, and the rules feel like they change every month. In early 2026 they actually did. This guide answers the question people search most, “how many power banks can I bring on a plane,” then gives you the watt-hour math and the current airline-by-airline limits so you can pack once and clear screening without a conversation at the bag drop.
We didn’t fly any of these routes or open any of these chargers. What follows is a synthesis of the primary regulators (the FAA and TSA in the US, plus the ICAO standard that countries adopt, as reported by the aviation press), the airlines’ own 2026 announcements, and reputable aviation reporting on why the rules tightened. Battery rules are volatile right now, so every carrier-specific number below is marked “as of June 2026,” and you should confirm with your airline before you fly. Where sources phrase a rule differently, we say so.
How do you convert mAh to watt-hours so you know your charger’s real rating?
Airlines regulate capacity in watt-hours (Wh), but the number printed largest on most power banks is milliamp-hours (mAh). The conversion is one line of arithmetic: Wh = (mAh / 1000) x voltage. Almost all lithium-ion power banks use a nominal cell voltage of 3.7 volts, so a 10,000 mAh pack works out to roughly 37 Wh.
That voltage is where people trip up. The 3.7V in the formula is the cell’s nominal voltage, not the 5V (or higher) that comes out of the USB port. Manufacturers rate watt-hours from the cells, so use 3.7V unless the label states a different figure. Many quality banks now print the Wh figure right on the casing because of these rules. If yours does, use that printed number.
Here’s the conversion at 3.7V, mapped onto the thresholds the next section explains. Figures are rounded; use the watt-hours printed on your battery if it differs.
| Rated capacity (mAh) | Approx. watt-hours (3.7V) | Tier |
|---|---|---|
| 5,000 mAh | ~18.5 Wh | Under 100 Wh, allowed |
| 10,000 mAh | ~37 Wh | Under 100 Wh, allowed |
| 20,000 mAh | ~74 Wh | Under 100 Wh, allowed |
| 26,800 mAh | ~99 Wh | Just under 100 Wh, allowed |
| 27,000 mAh | ~99.9 Wh | Just under 100 Wh but borderline, expect scrutiny |
| 30,000 mAh | ~111 Wh | 100 to 160 Wh, airline approval needed |
| 40,000 mAh | ~148 Wh | 100 to 160 Wh, airline approval needed |
| Over ~43,300 mAh | Over ~160 Wh | Banned from passenger aircraft |
The popular 10,000 mAh and 20,000 mAh banks land comfortably under 100 Wh and fly without fuss. A 27,000 mAh pack sits right on the 100 Wh line, about 99.9 Wh, so a clearly printed Wh label saves you an argument at the checkpoint. It’s the same mAh-to-Wh concept we cover for home power stations in watts vs watt-hours. The formula is identical, only the scale is larger.
Which power banks are allowed, need airline approval, or are banned?
Three tiers, all from the same FAA and ICAO framework that nearly every country follows. Under 100 Wh: allowed in carry-on with no special approval. 100 to 160 Wh: allowed only with your airline’s prior approval, and you may carry at most two spares. Over 160 Wh: forbidden on passenger aircraft entirely.
The under-100 Wh tier covers the vast majority of consumer power banks, phones, tablets, and laptops, which is why most travelers never think about watt-hours at all. The TSA page says these spare batteries belong in carry-on bags and are prohibited in checked luggage. There’s no federal quantity cap on personal-use banks under 100 Wh. Individual airlines impose their own caps, though, and those are stricter than the regulation, as the next section shows.
The middle tier, 100 to 160 Wh, is where larger laptop banks, some camera-rig batteries, and high-output travel banks live. The FAA framework limits you to two of these spares and requires the airline to sign off in advance, so call the carrier rather than gambling at the gate. Anything over 160 Wh, which includes most portable power stations and many drone batteries, isn’t allowed in the cabin or the hold on a passenger flight at all; it ships as regulated cargo instead. If your power station is rated in the hundreds of watt-hours, it’s not coming on the plane with you.
How many power banks can each major US and international airline let you bring in 2026?
Most major carriers cap you at two power banks as of June 2026, but Southwest allows only one, so the safe default is to check your specific airline before you pack. The international baseline, set by the ICAO addendum that aviation outlets report took effect on March 27, 2026, recommends a limit of two power banks per passenger. Many carriers aligned to that. A few went stricter.
The table below is a snapshot as of June 2026. These policies shifted several times in the first half of the year, and they’ll keep moving, so treat it as a starting point and confirm with the airline.
| Airline | Power banks allowed | Watt-hour ceiling | Overhead bin | Recharge in flight |
|---|---|---|---|---|
| Southwest | One (as of Apr 20, 2026) | Up to 100 Wh | Not allowed; keep accessible | Banned from seat power |
| American | Two (as of May 1, 2026) | Under 100 Wh each | Not allowed; keep visible | Banned from seat/USB |
| Delta | Two (reported) | Up to 160 Wh (100 to 160 needs approval) | Reported not allowed | Verify with carrier |
| United | Two | Up to 160 Wh (100 to 160 needs approval) | Not allowed (since Mar 1, 2026) | Verify with carrier |
| ICAO baseline (intl.) | Two recommended | Under 100 Wh; 100 to 160 with approval | Not allowed | Banned |
Where carriers differ is worth a closer look. Southwest is the strictest US major, limiting passengers to a single lithium power bank not exceeding 100 Wh as of April 20, 2026. American cut its allowance to two power banks under 100 Wh each, effective May 1, 2026, and requires them to stay visible and within reach. United and Delta are reported to permit two batteries up to 160 Wh, which is more generous on capacity but still subject to the 100-to-160 Wh approval step. Overseas, aviation reporting says Lufthansa, Emirates, Qatar Airways, Singapore Airlines, Air India, Cathay Pacific, and British Airways have aligned with the two-bank, no-charging standard, though several adopted it before the ICAO date and Emirates went stricter with a one-bank rule. Two is the common cap, one is possible, and the watt-hour ceiling varies. Verify yours.
Why must power banks go in your carry-on, never the checked bag or the overhead bin?
It comes down to fire access. A lithium battery that overheats can enter thermal runaway, a self-feeding reaction that’s hard to stop. In the cabin, crew can see it, reach it, and douse it within seconds. In the cargo hold, no one can, and investigators warn that a single battery fire in the hold can spread before anyone notices. So the TSA and FAA require spare batteries and power banks to travel in the cabin and bar them from checked bags on every major airline. That rule hasn’t loosened.
The overhead bin is a newer concern. Through 2025 and into 2026 several carriers extended the same logic: a bag buried in an overhead bin is almost as inaccessible as one in the hold, since crew would have to dig it out while it burns. United banned power banks from overhead bins effective March 1, 2026, after a power bank ignited in an overhead bin on an Air China flight in October 2025. American followed on May 1, 2026, requiring banks to stay visible in a seat pocket, on the tray table, or on your person. Southwest’s April 20 rule says the same: keep the bank on you or in an under-seat personal item, not overhead. The thread running through all of it is access. Put the power bank where you, and a flight attendant, can grab it instantly.
Can you recharge a power bank or device from it in flight, and which airlines banned it?
You can almost always charge your phone or laptop from a power bank during the flight. That’s the point of carrying one, and no major carrier we reviewed prohibits using a bank to power your own device. What a growing list of airlines now bans is recharging the power bank itself from the aircraft’s seat power or USB ports. The concern is that a faulty bank is most likely to overheat while it’s being charged.
Aviation reporting on the ICAO framework says it recommends against in-flight recharging of power banks, and US carriers have written it into policy. American Airlines explicitly prohibits connecting a power bank to seat power or USB to recharge it, while still allowing you to charge your phone or laptop directly from the aircraft outlet. Southwest likewise bans charging power banks from seat outlets where those exist. So the rule of thumb as of June 2026: power your phone from the bank, yes; refill the bank from the plane, increasingly no. If you want a topped-up bank waiting at the destination, charge it fully before you board.
What changed in 2026 and why?
Two things converged. The first is the safety record. The FAA’s public incident log shows a long and rising tally of lithium-battery events on aircraft, the kind involving smoke, fire, or extreme heat, with battery packs and portable chargers among the most common culprits. The FAA stresses that its list isn’t a complete count, since many incidents go unreported, and independent fire-service analysis has put the US rate at roughly two such events per week in recent years, with 2024 a record year. The agency has also specifically flagged the danger of power banks stored out of sight in overhead bins. A handful of high-profile fires sharpened the focus, including an Air Busan Airbus A321 destroyed on the ground in January 2025 and the October 2025 Air China overhead-bin fire that prompted United’s bin ban.
The second is coordination. For years each airline and country wrote its own policy, which is exactly why travelers found the rules confusing. In 2026, ICAO approved an addendum to its Technical Instructions, which aviation outlets report took effect on March 27, 2026, giving member states a shared baseline: power banks in the cabin only, a recommended two-bank limit, no overhead-bin storage, and no in-flight recharging. National regulators and carriers fell in line. So the flurry of “new” airline announcements in spring 2026 was largely carriers implementing one international standard at slightly different times, with a few going stricter than the baseline.
How do you pack and label batteries to clear screening fast?
A battery that announces its own watt-hours clears security fastest. Keep every power bank in your carry-on, make sure the watt-hour rating is printed and readable, protect the terminals, and stay within your airline’s quantity cap. Screeners and gate agents move quickly when the Wh figure is visible and clearly under 100.
A short pre-flight routine that owners and agencies consistently recommend:
- Carry-on only. Move every spare battery and power bank out of any bag you plan to check. If you get gate-checked, pull the banks out first; the FAA requires they be removed and kept with you in the cabin.
- Make the rating legible. If your bank shows only mAh, compute the Wh (use the table above), and for a borderline pack near 100 Wh, consider a small label. Manufacturers increasingly print Wh for exactly this reason.
- Prevent shorts. Cover exposed terminals, keep banks in their own pouch or original retail packaging, and don’t let loose keys or coins touch the ports.
- Count your banks. Stay within the cap for your specific carrier, which is one on Southwest and two on most others as of June 2026.
- Get approval early for 100 to 160 Wh. If a bank is in the middle tier, call the airline before travel day; you’re limited to two such spares and need sign-off.
- Board with it charged. Since in-flight recharging of the bank is increasingly banned, top it up before you leave for the airport.
Frequently asked questions
How many power banks can I bring on a plane in 2026?
Most major airlines allow two power banks as of June 2026, each under 100 Wh, in your carry-on. Southwest is stricter and permits only one. There's no federal cap on personal under-100 Wh banks, but airlines set their own limits, so confirm with your carrier before flying.
Can I put a power bank in my checked bag?
No. Spare lithium batteries and power banks must travel in the cabin, never in checked baggage, on every major airline. Crew can reach and extinguish a fire in the cabin but not in the inaccessible cargo hold, which is the entire reason for the rule. This hasn't changed in 2026.
What is the watt-hour limit for power banks on flights?
Under 100 Wh is allowed without special approval. From 100 to 160 Wh you need your airline's advance approval and may carry at most two spares. Anything over 160 Wh is banned from passenger aircraft and must ship as regulated cargo instead.
How do I convert my power bank's mAh to watt-hours?
Use Wh = (mAh divided by 1000) times voltage. Most lithium-ion banks are 3.7V nominal, so a 10,000 mAh bank is about 37 Wh and a 20,000 mAh bank is about 74 Wh. If your battery prints a Wh figure, use that number instead of calculating.
Can I charge my power bank during the flight?
Increasingly no. Several airlines, including American and Southwest, now ban recharging a power bank from seat power or USB ports, though you can still charge your phone or laptop from the bank. Charge the bank fully before you board so it is ready when you land.
Why can't I keep my power bank in the overhead bin?
Carriers including United and American now require power banks to stay visible and within reach rather than in the overhead bin, so crew can respond instantly if one overheats. United applied this from March 1, 2026, and American from May 1, 2026. Keep the bank on you or in an under-seat item.
Bottom line
The headline stays simple even though the policies churned. Carry power banks in the cabin, keep them under 100 Wh when you can, remember that most airlines cap you at two (Southwest at one) as of June 2026, keep them out of the overhead bin and accessible, and don’t count on recharging them from seat power. The watt-hour math is the only technical part, and it’s one line of arithmetic.
If you’re sizing larger batteries for life off the grid rather than for the gate, the same mAh-to-watt-hours logic carries over to bigger packs in watts vs watt-hours, and our backup power decision framework walks through choosing capacity once you understand the units. And because the airline rules above changed several times in early 2026, treat the official TSA and FAA PackSafe pages, plus your specific airline, as the final word before every trip.
This is a living guide. Battery and airline rules changed repeatedly in 2026 and continue to move; all figures here are drawn from the cited sources and dated “as of June 2026.” Always confirm the current rule with your airline and the primary regulator before you fly.