9 Power Bank and Lithium Battery Rules Every Flyer Should Know (2026 Guide)

A decade ago, the most complicated thing in your carry-on was a liquids bag. Today it may be the small rectangle that keeps your phone alive between connections. Power banks, laptops, vapes, earbuds, cameras and e-readers all run on lithium batteries, and aviation regulators and airlines have spent the last two years tightening the rules around them.

If you fly even occasionally, the old assumption that “a power bank is a power bank” no longer holds. The rules now cover how many you can carry, how large they can be, where they must be stored in the cabin, whether you can use them during the flight, and whether you can recharge them from the seat outlet. Some airlines ban in-flight use entirely. Others require the charger to stay in plain sight while it works. Most of the confusion comes from one fact: several layers of rules apply at once, and the strictest one wins.

This guide explains all nine rules in plain language, with the watt-hour math, comparison tables, packing checklists, and an FAQ. It was written in November 2026 against the latest regulator guidance, and it flags the places where airline policies differ so you can check before you fly.

Quick answer: Keep every power bank and spare lithium battery in your carry-on, never in checked luggage. Stay at or under 100 watt-hours (Wh) per battery. Carry no more than two power banks on most international flights (fewer on some airlines). Never recharge a power bank from the aircraft’s power. Check your airline’s rules on in-flight use before you board.

Why Lithium Battery Rules Exist in the First Place

Lithium-ion batteries are reliable when they are undamaged, properly made, and correctly packed, but they can fail in a way that is hard to stop. The FAA explains that every lithium-ion battery can experience thermal runaway, a self-heating reaction that can start without warning. Causes include damage, overheating, water exposure, overcharging, poor protection, or a manufacturing defect.

That is why the rules lean so heavily on location and visibility. In the cabin, a trained crew can spot smoke and respond within seconds. In a cargo hold, nobody can see a problem or reach it. The FAA notes that flight crews are trained to recognize and handle lithium-ion battery fires in the cabin. Nearly every rule below follows from that logic: keep batteries where people can see and reach them, keep them small enough that an incident stays manageable, keep them undamaged, and don’t push extra energy into them during the flight.

Incidents have also pushed regulators and airlines to act. Airlines have tightened their own rules in response to a rise in overheating incidents. The result is a patchwork that changes faster than most travel guides, which is why this article separates the baseline rules (set by regulators) from airline-specific rules (set by carriers).

Rule 1: Power Banks and Spare Lithium Batteries Go in Your Carry-On, Never in Checked Luggage

This is the oldest rule and the one that still catches the most travelers.

What the rule says: Spare lithium batteries, including power banks and portable chargers, must be carried on board and cannot be checked. The FAA’s passenger chart lists power banks as allowed in carry-on and not allowed in checked baggage. The same carry-on-only logic applies to vapes and e-cigarettes. Electronic cigarettes and vaping devices must be protected from damage and short circuits, and are carry-on only.

Why it matters: A battery fire in the hold can burn before anyone knows. In the cabin, the crew can reach it fast.

The gate-check trap

The most common way people break this rule is accidentally. You board a full flight, the overhead bins fill up, and a gate agent tags your roller bag to go in the hold. Your power bank, vape, or spare camera battery is still inside.

If your bag is gate-checked:

1. Stop at the gate and tell the agent you have lithium batteries in the bag.
2. Take out every power bank and spare battery and carry them onto the plane in your personal item or pockets.
3. Check the bag’s own battery if it’s smart luggage (see Rule 8).

Do this before the bag leaves your hands. Once it goes down the jet bridge, getting it back is much harder, and airlines have been known to hold flights to retrieve bags with batteries inside.

What can go in checked luggage?

Not everything lithium is banned from the hold. According to the FAA’s chart:

• Devices with built-in batteries (phones, laptops, tablets, cameras, watches) can be checked only if they are completely powered off and protected from accidental activation, and they must still meet the Wh limits.
• Small Bluetooth trackers such as AirTags and Tile devices are allowed in checked bags within small limits (no more than 0.3 grams of lithium content, or 2.7 Wh for lithium-ion types).
• Dry alkaline batteries (AA, AAA, and similar) are allowed in both carry-on and checked baggage.

Even when a device is technically allowed in a checked bag, putting it in your carry-on is safer. Checked bags get crushed, tossed, and left in hot cargo areas, and a damaged lithium battery is the worst thing to leave unattended.

Quick takeaway: If it’s a spare battery or power bank, it belongs on your body or under the seat in front of you, not in the hold.

Rule 2: Know Your Power Bank’s Watt-Hour (Wh) Rating, Because Milliamp-Hours Don’t Decide Anything

Watt-hours are the number that matters. Most power banks are sold by milliamp-hours (mAh), a marketing-friendly number printed in big letters on the box. Regulators, however, set limits in watt-hours (Wh), which measure total stored energy.

The three tiers of the Wh rule

The FAA’s guidance sets out the tiers clearly:

• Up to 100 Wh: allowed in the cabin without needing airline approval. Rechargeable batteries rated at 0-100 Wh are allowed on passenger aircraft.
• 101 to 160 Wh: these require approval from the air carrier, and there is a limit of two such spare batteries per person.
• Over 160 Wh: forbidden on passenger aircraft.

The practical reality is more restrictive than the FAA tiers. Many airlines simply refuse power banks above 100 Wh, even though the baseline rules technically allow an approval pathway. Reporting in 2026 also indicates that American, Delta, Southwest, Alaska, Hawaiian, and JetBlue cap each power bank at 100 Wh. And one 2026 industry summary says the pathway for power banks between 100 and 160 Wh is not expected to carry into IATA’s 68th edition, which takes effect on January 1, 2027. Treat 100 Wh as your real ceiling.

How to calculate watt-hours from mAh

Check the battery label first. Many power banks print the Wh rating right on the casing. If yours does, you’re done.

If it only lists mAh, use the FAA’s method. Multiply volts by amp-hours. If you only have milliamp-hours, divide by 1,000 to get amp-hours, then multiply by the voltage.

For almost every consumer power bank, the internal cells run at about 3.7 volts, so the shortcut is:

Wh = (mAh ÷ 1,000) × 3.7

Here is what that looks like for common sizes:

The 2026 guidance from several sources agrees on the math for the common sizes: a 10,000 mAh bank is about 37 Wh, a 20,000 mAh bank about 74 Wh, and a 30,000 mAh bank about 111 Wh, which crosses the 100 Wh line.

A real-world example

Say you buy a 30,000 mAh “high-capacity” bank to survive a long-haul trip. The label says 30,000 mAh. At 3.7 V:

30,000 ÷ 1,000 = 30 Ah → 30 × 3.7 = 111 Wh

That’s over 100 Wh. On most airlines, that bank would need prior approval at best, or be refused outright. Two 15,000 mAh banks (55.5 Wh each) would give you the same total capacity and sit comfortably under the limit, as long as your airline allows two power banks.

Watch for labeling quirks

• Some banks list both a cell capacity and an output capacity. Regulators care about the rated energy marked on the battery. If your label shows different numbers, use the Wh figure printed on the device when there is one.
• Some labels show a different voltage (for example, 3.6 V or 3.85 V). Use the voltage on your label when it differs from 3.7.
• If there’s no label at all, don’t fly with it. An unmarked power bank draws attention at security and may be refused at the gate.

Quick takeaway: Aim for 20,000 to 27,000 mAh at most if you want one bank, or two smaller ones. Anything labeled above 27,000 mAh (about 100 Wh) is the wrong size for flying.

Rule 3: Limit Yourself to Two Power Banks, and on Some Airlines Just One

For years, travelers could pack as many sub-100 Wh batteries as they liked. That changed in 2026.

The international baseline: two per passenger

The International Civil Aviation Organization (ICAO), the UN agency whose standards cover 193 member states, approved new power bank provisions that took effect on March 27, 2026. Under the improved specifications, power banks are limited to two per passenger, and passengers are prohibited from recharging them during flights. The ICAO Council, made up of 36 states, approved the changes, and the addendum goes to all 193 member states.

The amendment also separated power banks from ordinary spare batteries in the passenger table. Other national regulators have since issued their own notices. Reporting indicates the UK Civil Aviation Authority, Hong Kong’s Civil Aviation Department and Singapore’s aviation authority have all aligned with the two-bank cap.

What about the United States?

This is where it gets confusing, and where many online articles contradict one another. The FAA’s own passenger guidance does not set a general numerical cap on rechargeable batteries under 100 Wh. The FAA says there are no limits for rechargeable batteries under 100 Wh, as long as they are for personal use. The only FAA-level count limit applies to larger batteries: two spare batteries (including power banks) of 101 to 160 Wh per person.

At the same time, the FAA warns that many airlines, domestic and international, set stricter quantity and Wh limits for power banks and portable chargers than the baseline does, so you should check with your carrier before traveling.

In practice, that means:

• On international flights, the two-bank ICAO limit applies on top of everything else.
• On US domestic flights, the airline’s own policy usually decides the number, and most major carriers have settled on two. Reporting in 2026 describes American, Delta, United, Alaska, Hawaiian, and JetBlue as allowing two, with Southwest the strictest, allowing one.

Why “just one” is the safest plan

If you’re flying on a carrier you don’t know well, the best approach is to bring one reliable bank at or under 100 Wh, plus a short cable. If you really need more capacity, carry a second, but never a third. Packing three or four 10,000 mAh banks for a family trip, a habit that was fine in 2023, can now get one confiscated at the gate or checkpoint.

Family travel math

Limits apply per person. A family of four with four passengers could, on a two-bank airline, carry up to eight power banks in total, but only two per person, and each person’s banks should be in their own bag. Don’t pool all the power banks in one parent’s backpack. Keep each person’s batteries with that person so you don’t exceed the per-person cap on paper.

Quick takeaway: Plan for two power banks maximum, each 100 Wh or less. If you’re flying Southwest or an airline you haven’t checked, bring one.

Rule 4: Never Recharge a Power Bank From the Aircraft’s Power Supply

This rule is new enough that many experienced flyers haven’t heard of it. The old habit of plugging the power bank into the seat’s USB port overnight on a long-haul flight is now prohibited on most routes.

What changed

The ICAO amendment that took effect on March 27, 2026 bars passengers from recharging power banks during the flight. Passengers are prohibited from recharging them during flights. Industry summaries of the new text describe it as a requirement, not just a recommendation, and describe it as part of the move to treat power banks as their own category rather than ordinary spare batteries.

Airlines had already started down this path before the global rule. Reporting in 2026 shows American, Delta, United, Southwest, Alaska, Hawaiian, and JetBlue all bar recharging a power bank from seat power. Southwest, in particular, says the power bank itself may not be charged from the aircraft’s in-seat supply.

Why recharging is the riskiest moment

A battery is under more stress while it’s being charged, especially one that is old, cheap, or slightly damaged. Pushing energy into a power bank over several hours, in a seat pocket or under a blanket, creates the exact scenario regulators are trying to eliminate: a charging pack that is hidden, warm, and unattended.

What you can still do

The distinction that matters: the rule is about charging the power bank itself, not about using the power bank to charge your phone. (Whether you can use the power bank to charge a device is a separate question; see Rule 5.)

On a long flight, you can still use the seat’s USB or AC outlet to charge your phone, tablet, or laptop directly. Plug the device into the plane, not the power bank into the plane.

How to avoid getting caught out

1. Charge your power bank fully before leaving for the airport, and again at the hotel before the return leg.
2. Don’t plan around topping it up at the gate and then topping it up again in flight. Gate charging is fine; in-flight recharging is not.
3. Put the bank’s own charging cable away once you board so you’re not tempted.
4. Use the seat outlet for your devices, not for your banks.

Quick takeaway: The seat outlet is for devices. Never plug a power bank into it.

Rule 5: Check Whether You’re Allowed to Use Your Power Bank During the Flight at All

Being allowed to bring a power bank onto a plane doesn’t mean you’re allowed to use it in flight. This is the most inconsistent area of the rules, and where the differences between airlines matter most.

ICAO recommends against in-flight use

At the global level, ICAO’s amendment goes only as far as a recommendation on this point. Summaries of the amendment note that it recommends against using power banks to charge personal electronic devices onboard, which is different from a mandatory ban. That recommendation is what many airlines have turned into hard rules.

Airlines that ban in-flight use

A growing list of carriers prohibit using a power bank during the flight under any circumstances. Reporting in 2026 lists Singapore Airlines, EVA Air, China Airlines, Thai Airways and others as barring the use of portable batteries to charge devices in flight, and Qantas, Jetstar and Virgin Australia as limiting use of the seatback power supply or similar. Other 2026 summaries add Emirates, Korean Air, Asiana, Cathay Pacific, ANA, Japan Airlines and the Lufthansa Group (including SWISS, Austrian, Brussels, Eurowings and ITA Airways) to the list of carriers that prohibit in-flight use. Emirates’ restriction is reported to have taken effect on October 1, 2025, and to limit passengers to one power bank.

If you fly any of these carriers, the plan is simple: charge everything on the ground, use the aircraft’s own outlets for devices, and keep the power bank packed away.

US airlines: use is allowed, with conditions

In the United States, you can generally use a power bank to charge a phone, but several airlines have attached conditions:

• Southwest requires the power bank to be visible while it is in use, rather than inside a bag or overhead bin, so crew can respond quickly if it overheats. It also doesn’t allow the bank to be charged from the in-seat power.
• American also wants the charger visible while in use. Reporting describes its limit as two chargers per passenger, kept in plain view such as a seat pocket or tray table.
• Delta reportedly does not allow power bank use during taxi, takeoff, and landing, and asks that banks not be stored in the overhead bin.
• United asks passengers to keep portable chargers and vapes within reach, either on their person or in a personal item, rather than in the overhead bin.
• Alaska and Hawaiian have been reported to restrict use during taxi, takeoff, and landing.
• JetBlue has been reported to say a power bank must not be used to charge a device on board.

Because these policies are changing and sources occasionally disagree on details, treat this list as a map of what to check, not as a substitute for reading your airline’s current “dangerous goods” or “lithium batteries” page.

The “visible when in use” rule in practice

Where it applies, “visible” means you can see the bank and the crew can see it: on your tray table, in the seat pocket, or in your hand. It does not mean buried in a backpack under the seat, wrapped in a jacket, or tucked in the overhead bin with a cable snaking out of it. If you must use a power bank on a flight, set it where it can be seen and don’t cover it.

A decision shortcut

Ask three questions before using a power bank in flight:

1. Does my airline ban in-flight use? If yes, don’t.
2. Is it taxi, takeoff, or landing? If yes, don’t (Delta and others restrict it).
3. Can I see the bank right now? If not, move it.

Quick takeaway: Assume nothing. Look up your airline’s policy before you leave home, and charge your devices to full before boarding so you never need to find out the hard way.

Rule 6: Keep Your Power Bank Within Reach, Not in the Overhead Bin

The overhead bin is the worst place for a power bank on a modern flight, and an increasing number of airlines say so explicitly.

Why the overhead bin is a problem

A lithium battery fire needs a fast response. Smoke from inside a closed overhead bin may not be noticed for minutes, and a flight attendant can’t reach a bin that’s full of luggage. In the cabin, a device in your seat pocket, on your lap or in a small bag under the seat can be seen, smelled and reached immediately.

What airlines now say

• Delta asks passengers to keep power banks where they’re easy to reach: under the seat in front, in the seatback pocket or on your person, and not in the overhead bin so the crew can respond quickly.
• United has similar guidance, asking that chargers be kept in a personal item or on the person.
• Southwest and American combine the placement rule with a visibility rule while a bank is in use.

Where to pack it

The best pattern is a dedicated, accessible pouch in your personal item (the bag that goes under the seat). That way:

• It passes security easily and can be pulled out if officers want a closer look.
• It never ends up in the overhead bin when you stow your main carry-on.
• If the gate agent forces you to check your roller bag, it’s already with you.

Seat-pocket considerations

A seat pocket is allowed on most airlines, but avoid stuffing it. A power bank wedged between a magazine, a water bottle, and a jacket can get squeezed, which is a bad habit for any lithium battery. Keep it flat and free.

Never store a battery where it can be crushed

Don’t put a power bank where someone might sit, lean, or press on it: under a coat on the seat, in a reclined-seat gap, or under the seat in front where bags slide. Physical damage is one of the main causes of thermal runaway, and the FAA lists damage and improper protection among the triggers.

Quick takeaway: Power banks live under the seat or on you, not in the overhead bin.

Rule 7: Protect the Terminals and Never Fly With a Damaged, Swollen, or Recalled Battery

A battery that’s allowed on paper can still be refused, or become dangerous, if it’s damaged or packed carelessly.

Protect against short circuits

The FAA’s passenger table requires spare batteries to be protected from damage and short circuits. Short circuits happen when the metal contacts of a battery touch something conductive: coins, keys, loose cables, even other batteries. Before you fly:

• Keep each power bank in its own pouch or sleeve, or in a dedicated pocket.
• Cover exposed terminals on loose spare batteries with tape or keep them in their original retail packaging or a plastic battery case.
• Don’t toss a power bank into a bag with coins, keys, or metal tools.
• Keep cables coiled and separate so a connector can’t bridge contacts.

Never fly with a damaged or recalled battery

The FAA is explicit on this point. Damaged or recalled batteries and battery-powered devices that are likely to produce sparks or dangerous heat must not be carried aboard an aircraft, in carry-on or checked bags, unless the damaged or recalled battery has been removed or otherwise made safe. The FAA also recommends contacting your airline for further guidance on transporting damaged or recalled batteries.

Warning signs that a power bank should stay home:

• Swelling or bulging of the casing
• A cracked, dented, or crushed shell
• Unusual heat during normal charging or use
• A burning, chemical, or sweet smell
• Leaking fluid or discoloration
• A manufacturer or consumer-safety recall covering that model
• Sudden short runtime after a drop or heavy impact

If any of these apply, retire the battery. Many cities and electronics retailers run lithium battery recycling programs, and discarding it safely is a better outcome than finding out in a security line.

Choose a well-made power bank

Cheap unbranded banks are the highest-risk category, and they are also the likeliest to carry mislabeled capacities. When you buy a bank for flying:

• Look for a printed Wh rating (or at least a clear mAh and voltage) on the casing.
• Buy from established brands with visible safety certifications for your region.
• Avoid banks with missing, scratched-off, or obviously inconsistent labels.
• Retire any bank older than a few years that shows wear, even if it still works.

Regulators in some countries have also begun enforcing certification and labeling requirements on power banks in aviation, so it’s worth checking local rules before an international trip, especially in Asia.

Practical packing checklist

1. Inspect your bank for swelling, cracks, or heat before leaving home.
2. Confirm the Wh label is legible.
3. Put it in a pouch with no metal objects.
4. Put the pouch in your personal item.
5. Keep the charging cable in a separate pocket.

Quick takeaway: A battery that is protected, intact, and clearly labeled gets through security. One that’s swollen, damaged, or recalled doesn’t board at all.

Rule 8: Know the Rules for Every Other Lithium Device in Your Bag

Power banks get the headlines, but most travelers carry a dozen lithium-powered items. Each category has its own rule, and mixing them up is how people end up with surprise confiscations.

Laptops, phones, tablets, cameras, and watches

These are covered by the same Wh restrictions as spare batteries. They go in carry-on without trouble. If you check one, it must be completely powered off and protected from accidental activation and unintentional use. In sleep mode, it can wake up, overheat inside a padded bag, and become a problem. Fully shut it down.

Spare camera, drone and laptop batteries

Detachable batteries count as spare lithium batteries. They follow the carry-on only rule, the 100 Wh limit (with the same approval pathway up to 160 Wh) and the short-circuit protection requirement. Professional camera and drone users should pay particular attention: some drone and cinema-camera batteries sit between 99 and 160 Wh. Count them against any per-person limit your airline imposes, because airline caps on “spare batteries” can differ from the new “power bank” cap.

E-cigarettes and vapes

Lithium-ion vapes and e-cigarettes are carry-on only and must be protected from damage and short-circuiting. Several airlines also restrict charging or using vapes onboard. Use is prohibited on virtually all commercial flights, and charging a vape from a seat outlet or power bank is widely forbidden or discouraged. Pack the device and spare batteries in the cabin, and don’t use or charge them in flight.

Bluetooth trackers (AirTags, Tile and similar)

These are low-risk and typically fine in both cabin and checked bags. Trackers in checked baggage must contain no more than 0.3 grams of lithium (for lithium metal) or no more than 2.7 Wh (for lithium-ion). Most consumer trackers use coin cells that meet this.

Non-rechargeable lithium metal batteries

Cameras, flashlights, watches, and some medical devices use these. Spare lithium metal batteries go in carry-on only, with no more than 2 grams of lithium per battery, and must be protected from damage and short-circuiting. Almost all consumer coin and AA lithium cells meet this threshold.

Smart luggage with built-in batteries

Luggage with a built-in charger or motor is one of the most overlooked items. The FAA says bags equipped with lithium batteries must travel as carry-on unless the batteries can be removed from the bag, and removed batteries must follow the same rules as spare batteries. If the battery can’t be removed, the bag can’t be checked. If you buy smart luggage, make sure the battery pops out easily, or plan on carrying the bag on.

Mobility devices and wheelchair batteries

Travelers who use mobility aids have special allowances and special requirements, and advance contact with the airline is important. The FAA’s chart lays out the key points:

• Spare or removed wheelchair batteries are carry-on only, in a maximum of one spare battery up to 300 Wh, or two spare batteries up to 160 Wh each.
• Mobility devices with installed batteries protected by design are generally checked, and the passenger must tell the airline where the battery is on the device.
• Passengers must advise the airline of battery location in most cases, and extra check-in time may be needed.

If you travel with a mobility device, contact your airline’s accessibility team well before departure.

Power stations, solar generators and large battery systems

Portable power stations used for camping and home backup are a recurring problem at airports. Lithium battery-powered generators exceed the 160 Wh limit and are forbidden in both carry-on and checked baggage. If you want one at your destination, buy it there or ship it through a compliant freight service.

E-bike and e-scooter batteries

E-bike batteries typically run from 300 to 700 Wh, well above the 160 Wh ceiling, which means they cannot travel as passenger baggage. Plan to ship them via a specialist freight carrier, or rent at your destination.

Quick reference table: where lithium items can go

Source for the table: FAA PackSafe guidance, last updated October 2, 2026. Individual airlines and security agencies can be stricter.

Quick takeaway: Every lithium item has its own tier, and the rule for the spare is almost always stricter than the rule for the installed battery.

Rule 9: Remember That the Strictest Rule Wins, and Know What to Do if a Battery Overheats

The ninth rule is a way of thinking, not a number. Because several layers of regulation overlap, whichever rule is strictest on your route is the rule you follow.

The layers of rules that apply to one trip

1. International standard (ICAO/IATA). Sets the global baseline: two power banks, carry-on only, no recharging onboard.
2. National regulator (FAA, UK CAA, EASA, CAAS and others). Applies the baseline in each country. The FAA’s table is based on US DOT regulations at 49 CFR 175.10, and it notes that TSA, individual airlines, and international rules can be more restrictive.
3. Security agency (such as TSA). Controls what’s screened and what officers can confiscate.
4. The airline. Often the strictest layer: one bag, no in-flight use, visible while in use, no overhead storage.
5. The country you’re departing from, connecting through, or arriving in. A rule on your itinerary, even on a connecting flight operated by a different airline, can apply to your whole journey.

Why codeshares and connections matter

Suppose you book a ticket through one carrier but fly the second leg on a partner. The partner airline’s rules apply on its aircraft. If your first leg allows in-flight use and the second prohibits it, you need to comply on the second. Similarly, if your connection runs through Hong Kong or Singapore, local rules there apply at the security checkpoint, not just the rules in your departure country.

Build a one-minute pre-flight check

Before every trip, spend a minute on this list:

1. How many power banks are allowed on each airline on my itinerary?
2. Is in-flight use allowed on each?
3. Is the bank under 100 Wh, and is the label readable?
4. Do I know where it will be stored in the cabin?
5. Is any country on my route known for stricter enforcement?

If you can answer all five, you’re ready.

What to do if a battery overheats, smokes, or catches fire

The FAA’s guidance is simple: passengers should notify the flight crew immediately if a lithium-ion battery or portable electronic device is overheating, expanding, smoking, or burning. Don’t wait to see if it settles down, and don’t try to hide it.

General principles that apply (follow crew instructions above all):

• Alert a flight attendant at once. Speed matters most.
• Don’t touch a hot or smoking device with bare hands.
• Don’t put it in the overhead bin, a bag, or a seat pocket. Leave it where the crew can reach it.
• Follow the crew’s directions. Cabin crews have training and equipment for battery fires.
• Don’t try to charge it again, even if it seems to cool down.

For devices that fall into the seat track or between cushions, tell the crew. Don’t try to dig it out by squeezing or forcing the seat, because pressure can short the battery.

What happens if you break a rule

For most travelers, the consequence is minor: a power bank is confiscated at security, or a gate agent asks you to put it in your personal item. But undeclared or mishandled dangerous goods are a serious matter. Penalties vary by country and violation, and a battery that causes an in-flight incident can lead to a diverted flight, delays for everyone, and potential enforcement action against the person responsible. It’s far easier to follow the rules than to explain after the fact.

Quick takeaway: Apply the strictest rule on your itinerary, and know your emergency response in advance. Alert the crew immediately if a battery misbehaves.

Power Bank Rules by Airline: Quick Comparison Table (as of November 2026)

Airline policies change often, and sources occasionally disagree on details. Use this table as a starting point and always verify on your airline’s current dangerous goods or lithium battery page before you travel.

Sources: FAA PackSafe (updated October 2, 2026); ICAO announcement of March 27, 2026; 2026 airline policy roundups from Belkin, Your Mileage May Vary, Houston Chronicle and BatteryRank. Policy details for individual airlines should be confirmed with the airline.

How to Choose a Power Bank That’s Easy to Fly With

If you’re shopping for a new bank, a few simple choices make every flight easier.

Pick the right capacity

• 10,000 mAh (about 37 Wh): Enough for roughly two phone charges. Light, compact, and universally accepted.
• 20,000 mAh (about 74 Wh): The sweet spot for frequent flyers. Recharges a phone four or five times, or tops up a tablet, and is still well under 100 Wh.
• 25,000 to 27,000 mAh (about 92 to 100 Wh): The practical maximum. Close to the limit, so check the label carefully and expect closer inspection.
• Above 27,000 mAh: Avoid for air travel. These banks cross the 100 Wh line.

Look for a clear Wh label

The most flight-friendly power banks print the watt-hour figure on the casing. It saves you a calculation and avoids an argument at security.

Consider two smaller banks over one large one

Two 15,000 mAh banks give you about 111 Wh of total capacity but keep each bank at 55.5 Wh. This also gives you redundancy, though you should confirm your airline allows two before you rely on this approach. Southwest, for example, has been reported to cap passengers at one.

Prefer banks with built-in cables and protection

Banks with integrated cables reduce loose-cable risk. Look for overcharge, over-discharge, over-current, and short-circuit protection features and recognized safety certifications.

Replace old and abused banks

Batteries degrade. If your bank is several years old, has been dropped repeatedly, gets noticeably warm, or no longer holds a charge, replace it before a big trip.

Your Pre-Flight Lithium Battery Checklist

Print or screenshot this list for your next trip.

One week before:

• Check your airline’s current power bank and lithium battery policy (and your connecting airline’s).
• Check the Wh rating on every bank and spare battery.
• Retire any swollen, damaged, or recalled batteries.
• Check for local rules at your destination and any connection points.

Packing day:

• Put all power banks, spare batteries, and vapes in your carry-on, not checked bags.
• Limit yourself to two power banks, or one if your airline requires it.
• Cover terminals or use individual pouches.
• Fully power down any device you plan to check.
• Remove the battery from smart luggage if the bag will be checked.

At the airport:

• Keep your power banks in an accessible pouch in your personal item.
• If your bag is gate-checked, take every battery out first.
• Be ready to show the Wh label if asked.

On the plane:

• Keep your power bank under the seat, in the seat pocket, or on you, never in the overhead bin.
• Use your airline’s seat power for devices, never for the power bank.
• If your airline allows in-flight use, keep the bank visible and don’t use it during taxi, takeoff, or landing.
• If anything gets hot, swells, or smokes, tell the crew immediately.

Common Mistakes Flyers Make With Power Banks

1. Packing a power bank in checked luggage because it was “just one small one.”
2. Forgetting batteries when the carry-on is gate-checked.
3. Buying a “high-capacity” bank over 100 Wh and assuming it’s fine because it was sold as “airline-approved.”
4. Trusting the mAh number instead of calculating Wh.
5. Carrying three or four small banks on an airline with a two-bank cap.
6. Plugging the bank into the seat power to recharge during a long-haul flight.
7. Storing the bank in the overhead bin with a cable running to a seat outlet.
8. Using the bank on an airline that bans it, such as many Asian and Middle Eastern carriers.
9. Flying with a swollen or dented bank because it “still works.”
10. Assuming the rule is the same on every airline, including partner flights.

Frequently Asked Questions About Power Banks and Lithium Batteries on Planes

Can I bring a power bank on a plane?

Yes. Power banks are allowed on passenger aircraft as long as they travel in your carry-on baggage and meet the watt-hour limits. The FAA allows power banks up to 100 Wh and requires airline approval for 101 to 160 Wh. They are not allowed in checked bags.

Can I put a power bank in my checked luggage?

No. Spare lithium batteries, including power banks and portable chargers, must be carried on and cannot be checked. If your carry-on is gate-checked, remove the power bank first and carry it with you.

How many power banks can I bring on a plane?

It depends on the route and airline. ICAO’s rule, effective March 27, 2026, limits passengers to two power banks. The FAA’s own page sets no cap for batteries under 100 Wh, but airlines can be stricter. Reporting in 2026 describes most major US airlines as allowing two, with Southwest allowing one. Check your airline’s policy.

What size power bank is allowed on a plane?

Up to 100 Wh is allowed without approval. That’s roughly 27,000 mAh at 3.7 V. Between 101 and 160 Wh needs airline approval, and many airlines refuse it. Above 160 Wh is forbidden.

Is a 20,000 mAh power bank allowed on a plane?

Yes. A 20,000 mAh bank is about 74 Wh at 3.7 V, which is under the 100 Wh limit on essentially every airline.

Is a 30,000 mAh power bank allowed on a plane?

Usually not without approval. A 30,000 mAh bank is about 111 Wh, which exceeds the 100 Wh threshold. Many airlines refuse banks above 100 Wh entirely.

Is a 26,800 mAh power bank allowed?

Typically yes. It works out to about 99.2 Wh at 3.7 V, which is just under the limit. Check the label and expect that security may look at it closely.

How do I convert mAh to Wh?

Divide milliamp-hours by 1,000 to get amp-hours, then multiply by the battery’s voltage. For most power banks, use 3.7 V. Example: 10,000 mAh ÷ 1,000 = 10 Ah × 3.7 V = 37 Wh.

Can I use my power bank during the flight?

It depends on the airline. ICAO only recommends against using power banks to charge devices on board, but many airlines have turned that into a ban, including Singapore Airlines, Emirates, Cathay Pacific, Korean Air, Qantas and the Lufthansa Group, according to 2026 reports. US airlines generally allow use but add conditions, such as keeping the bank visible, not using it during taxi, takeoff, and landing, and not storing it in the overhead bin.

Can I charge my power bank on the plane?

No. Since March 27, 2026, ICAO’s rules prohibit recharging power banks during flights, and major US airlines have matched the restriction. You can charge your phone or laptop from the seat outlet, but not the power bank itself.

Can I keep my power bank in the overhead bin?

Most airlines now tell you not to. Delta and United, for example, ask passengers to keep power banks within reach, such as under the seat in front, in the seat pocket, or on the person, so the crew can respond quickly to any overheating.

Do I need to take my power bank out of my bag at security?

Requirements vary by country and airport. Some checkpoints ask you to remove power banks and electronics from the bag, and officers can ask to inspect a bank. Keep yours in an accessible pouch so you can show it quickly. Check your departure airport’s security guidance.

Can I bring a power bank in my personal item?

Yes. In fact, it’s the best place for it. A personal item under the seat keeps the bank within reach and out of the overhead bin.

What if my power bank doesn’t have a watt-hour label?

Calculate Wh from the mAh and voltage. If the label doesn’t list either, or if the information is unreadable, don’t fly with it. Security officers and gate agents can refuse unlabeled batteries.

Can I bring a vape on a plane?

Yes, in carry-on baggage only, protected from damage and short-circuiting. Vapes and e-cigarettes are carry-on only. Using or charging them on board is prohibited on virtually all airlines.

Can I bring a laptop in checked luggage?

It’s allowed if the laptop is completely powered off and protected from accidental activation, but a carry-on is much safer. Laptops in checked bags are exposed to rough handling and can’t be reached if something goes wrong.

Can I fly with an AirTag or Bluetooth tracker in my checked bag?

Yes. Small trackers that use coin cells are allowed in checked bags, within limits of about 0.3 grams of lithium or 2.7 Wh for lithium-ion types.

Can I bring a portable power station on a plane?

No. Battery-powered generators and portable power stations exceed the 160 Wh limit and are forbidden in both carry-on and checked baggage.

What happens if my power bank is too big?

At security, the officer may confiscate it. At the gate, an agent may deny boarding with the item. If you’re over 100 Wh, ask your airline for written approval before you travel, or choose a smaller bank. Remember that many airlines will not approve banks over 100 Wh at all.

What should I do if my power bank gets hot or starts smoking on the plane?

Alert a flight attendant immediately. The FAA tells passengers to notify the flight crew right away if a lithium-ion battery or device is overheating, expanding, smoking, or burning. Don’t try to hide it, move it into a bin, or handle it with bare hands.

Do the rules change often?

Yes. Rules changed several times between 2025 and 2026, and the 2027 edition of the IATA regulations is expected to change the 100 to 160 Wh approval pathway for power banks. Always check your airline’s policy a few days before you fly.

Where can I find official guidance?

The FAA’s PackSafe pages explain US passenger battery rules, ICAO publishes the international standards, and your airline’s dangerous goods page lists carrier-specific limits. The FAA’s Office of Hazardous Materials Safety also takes questions from travelers.

Final Thoughts: The Easiest Way to Stay Compliant

If you remember nothing else, remember this simple formula:

Carry-on only + under 100 Wh + no more than two (or one) + never recharge onboard + check your airline.

Most travelers who run into trouble with lithium batteries aren’t doing anything reckless. They’re relying on a rule that was true a few years ago. The easiest fix is a habit: before every trip, look up your airline’s lithium battery policy, check the Wh label on your power bank, and move your batteries to your personal item before you reach the gate.

Do that, and your power bank will do what it’s meant to do, which is keep you connected without becoming the reason your flight is delayed.