QUICK ANSWER
For U.S. flights, a power bank rated at 100 watt-hours (Wh) or less is generally allowed in carry-on baggage. That equals approximately 27,000 mAh at 3.7V. Power banks must never go in checked luggage. Units rated 101–160 Wh require airline approval under FAA rules, and individual airlines may impose stricter limits.
POWER BANK TRAVEL GUIDE
Know Your Power Bank Capacity Before You Fly
Imagine arriving at the airport with a fully charged 30,000 mAh power bank, only to discover that its capacity may exceed your airline’s standard allowance. The problem is not always the size printed on the charger. Airlines and aviation authorities use watt-hours to measure battery energy.
Understanding the difference between mAh and Wh can help you choose the right portable charger, avoid airport delays, and travel with greater confidence.
Carry-on only
mAh vs Wh explained
2026 travel guidance
Key Takeaways
✓ Around 27,000 mAh at 3.7V equals approximately 100 Wh.
✓ Power banks must be packed in carry-on baggage, not checked luggage.
✓ Power banks rated 101–160 Wh need airline approval under the FAA’s general rules, but some airlines do not accept them.
✓ Check the airline’s current capacity, quantity, packing, and in-flight usage restrictions before departure.
Important Travel Guidance
This article is for general educational guidance only. It does not guarantee specific results and does not replace advice from the manufacturer or a qualified professional. Some battery, charging, and power tasks need a trained professional or must follow local regulations and transport rules. Check your device’s user manual and current local rules, and consult a qualified professional when needed.
Why Does the mAh Number Cause Confusion at the Airport?
A traveler might compare two power banks and assume that the one with the lower mAh rating is always smaller and safer to bring on a plane. However, battery capacity is more complicated than that.
For example, someone carrying a 20,000 mAh portable charger may have no difficulty understanding its capacity. Another traveler carrying a 30,000 mAh model may wonder whether it exceeds the permitted limit. Both numbers need to be converted into watt-hours before making a reliable comparison.
What is mAh?
Milliamp-hours (mAh) describe how much electric charge a battery can store. Manufacturers commonly use this measurement when advertising power banks, rechargeable batteries, and other portable electronics.
A higher mAh rating generally means the power bank can store more electric charge at the same voltage. However, mAh alone does not show the total energy stored inside the battery.
Why do airlines use watt-hours?
Watt-hours (Wh) measure the amount of energy stored in a battery. This measurement considers both battery capacity and voltage.
That distinction matters because two batteries with identical mAh ratings can store different amounts of energy when their operating voltages differ.
For airline travel, the Federal Aviation Administration (FAA) uses watt-hours to determine which rechargeable lithium-ion batteries passengers can carry.
How to convert mAh into Wh
The calculation is simple:
POWER BANK CAPACITY FORMULA
Wh = (mAh ÷ 1,000) × Voltage
Use the battery’s nominal internal voltage, not the USB output voltage.
Most traditional lithium-ion power banks advertise capacity based on an internal cell voltage around 3.7V. Some models use a different nominal voltage, so always check the manufacturer’s specifications.
For example, a 20,000 mAh power bank rated at 3.7V works out to:
20,000 ÷ 1,000 × 3.7 = 74 Wh
This is below the FAA’s standard 100 Wh threshold. A traveler can generally bring this size in carry-on baggage, subject to the operating airline’s additional requirements.
What Power Bank Capacity Is Allowed on a US Flight?
A passenger flying from New York to Los Angeles with a portable charger needs to understand three important capacity levels. These are based on the FAA’s current passenger battery guidance, updated October 2, 2026.
1. Power banks rated up to 100 Wh
This is the standard category for most everyday portable chargers.
The FAA allows spare rechargeable lithium-ion batteries rated at 100 Wh or less on passenger aircraft without special airline approval under its general rules. Power banks must remain in carry-on baggage.
At a nominal voltage of 3.7V, 100 Wh equals approximately 27,027 mAh. Therefore, a 10,000 mAh or 20,000 mAh power bank is generally comfortably below this threshold.
2. Power banks rated between 101 and 160 Wh
These larger batteries receive different treatment. Under FAA guidance, passengers need approval from the operating airline before carrying a spare lithium-ion battery in this category.
The allowance is limited to two qualifying larger spare batteries per person. However, this does not mean every airline accepts a power bank of this size.
For example, Delta’s published power-bank policy sets a stricter limit of two power banks per passenger, with each one no larger than 100 Wh. American Airlines also publishes a two-power-bank limit with a maximum of 100 Wh per charger.
3. Power banks above 160 Wh
A standard consumer power bank exceeding 160 Wh is not permitted on passenger aircraft under the general FAA passenger battery rules.
For example, a 50,000 mAh power bank rated at 3.7V contains approximately 185 Wh. That is above the usual passenger limit.
Do not assume that a larger portable charger can be accepted simply because it fits inside a backpack.
These are FAA baseline thresholds, not a promise of acceptance by every airline. Check the FAA’s passenger battery guidance before departure.
For travelers using Delta or American Airlines, read the operating carrier’s Delta battery policy or American Airlines restricted-items policy rather than relying only on the FAA maximum.
HEADS-UP: 100 Wh Is Not the Same as 100,000 mAh
A common mistake is treating the Wh and mAh numbers as interchangeable. At 3.7V, 100 Wh is about 27,000 mAh, not 100,000 mAh. Check the voltage and calculated energy before packing your charger.
Before moving on, use this simple decision path to determine what to do with your battery.
POWER BANK FLIGHT DECISION PATH
Yes: use that rating. No: calculate Wh using the manufacturer’s nominal voltage and mAh information.
Check the airline’s own quantity, storage, and usage rules, then place it in carry-on baggage.
Contact the airline for approval. Do not assume the airline accepts it merely because the FAA allows approved larger batteries.
Do not take it aboard under standard passenger rules. A damaged or recalled battery must not be carried unless it has been made safe under applicable guidance.
The safest choice is to select a clearly labeled power bank that meets the operating airline’s specific requirements.
How to Check Your Power Bank Before You Leave
Imagine packing for a weekend trip and discovering that the capacity label is hidden under a protective cover. Checking the specifications at home is much easier than trying to explain an unidentified battery at the airport.
Start by inspecting the back or bottom of the power bank. Look for its rated capacity, voltage, Wh rating, manufacturer name, and model number.
Use a simple battery inspection checklist
Complete these four checks before placing the charger inside your travel bag.
PRE-FLIGHT POWER BANK CHECKLIST
✓
Capacity label
Confirm the printed mAh and Wh values. Keep the information readable.
✓
Battery condition
Look for swelling, cracks, leaks, unusual heat, and other signs of damage.
✓
Airline restrictions
Check capacity and the number of power banks allowed by the operating airline.
✓
Safe packaging
Prepare a protective pouch and prevent accidental activation or short circuits.
These checks help identify common problems before airport screening. They also reduce the chance of carrying a charger that does not meet the airline’s requirements.
What can you check yourself, and when should you seek help?
Most capacity checks are simple. However, an unclear battery specification or a damaged power bank should not be treated as an ordinary packing issue.
TIP: KEEP THE ORIGINAL PRODUCT INFORMATION
Keep the manufacturer’s product page, manual, or specification sheet available on your phone. This can help you explain an unfamiliar capacity rating, although airline staff may still require clear battery markings or decline a unit that cannot be verified.
How to Pack a Power Bank Without Creating a Safety Risk
A passenger carrying a 20,000 mAh charger should think about more than its rated capacity. The way the battery is packed also matters.
Power banks contain lithium-ion cells. These batteries can overheat if damaged, crushed, short-circuited, or exposed to conditions that cause an internal failure.
Keeping spare lithium batteries inside the passenger cabin allows the flight crew to respond if a battery begins overheating or smoking.
Carry-on baggage is the correct place
Power banks are classified as spare lithium-ion batteries because they store energy for use with other devices.
Under FAA rules, spare lithium batteries, including portable chargers, are prohibited in checked baggage. Pack your power bank in your carry-on bag or personal item.
There is another important situation to understand. If the airline takes your carry-on bag at the boarding gate and moves it into the cargo hold, remove the power bank first and keep it with you in the cabin.
Protect the battery and its charging ports
Keep the power bank away from keys, coins, metal objects, and other items that could contact exposed electrical terminals. Use its original packaging, a suitable protective case, or an individual pouch.
Prevent the charger from being crushed under heavy luggage. Avoid storing it next to sharp items that could damage its casing.
SAFETY NOTE
Never pack a swollen, leaking, damaged, smoking, or unusually hot power bank. Do not open or attempt to repair its lithium-ion battery pack. If a battery becomes hot, expands, hisses, or produces a burning smell, stop using it and contact the manufacturer. If a problem occurs during flight, alert the cabin crew immediately.
Best packing practices versus less-effective habits
Simple packaging choices can reduce the risk of accidental damage and make screening easier.
Which safety habits deserve the most attention?
Not every packing precaution has the same practical importance. Use this relative priority guide when preparing your travel bag.
POWER BANK TRAVEL SAFETY PRIORITIES
Check the Wh rating90%
Use carry-on storage90%
Inspect battery condition75%
Protect battery terminals75%
Check airline restrictions90%
Editorial practical-priority guide, not measured research data or official safety scores.
Give the most attention to capacity verification, carry-on placement, and current airline policies. These are essential checks, not optional extras.
TIP: AVOID LAST-MINUTE PACKING
Check the power bank the evening before departure. This gives you time to find the manufacturer’s specifications, contact the airline, or choose a smaller charger if your current one exceeds the airline’s allowance.
What Should You Do If Your Power Bank Exceeds the Limit?
Suppose a traveler discovers that a portable charger is rated at 111 Wh just before leaving for the airport. That is approximately equivalent to a 30,000 mAh power bank at 3.7V.
The next step is not to hide the capacity label or assume airport staff will overlook the rating. The traveler needs to check the applicable approval rules and the airline’s own restrictions.
Follow this pre-flight preparation timeline
A simple preparation process helps avoid confusion and unnecessary airport delays.
BEFORE YOUR FLIGHT: STEP-BY-STEP TIMELINE
Check the power bank’s printed Wh rating, model information, and physical condition. Determine whether its capacity is suitable for the intended flight.
Read the airline’s battery policy. Contact the carrier if the charger falls into the 101–160 Wh range and ask whether approval is available.
Place the approved power bank inside a protective pouch. Keep it separate from metal objects and inspect it for visible damage.
Keep the power bank in your cabin baggage. If the airline requires the carry-on suitcase to be checked, remove the charger first.
Follow the airline’s in-flight power-bank restrictions. Some carriers prohibit using the power bank to charge devices or recharging the power bank from aircraft outlets.
This timeline is especially useful for passengers connecting through several airports. Different airlines may apply different conditions, particularly on international or codeshare itineraries.
Myth vs. reality: A power bank under 160 Wh is always accepted
MYTH
Any power bank below 160 Wh can travel without difficulty because the FAA permits larger batteries with approval.
REALITY
The FAA’s approval framework does not force airlines to accept every qualifying power bank. A carrier may impose a lower capacity limit, a smaller quantity allowance, or additional in-flight restrictions. Check the airline before traveling.
For someone who travels frequently, choosing a power bank rated comfortably below 100 Wh is usually the simpler option.
Which Power Bank Size Is Best for Your Flight?
A business traveler carrying a smartphone and wireless earbuds may not need the same battery capacity as a photographer or someone traveling for a full day without access to an electrical outlet.
However, choosing the largest capacity available is not always the best decision. Weight, charging speed, device compatibility, airline restrictions, and the number of chargers allowed also matter.
Compare common power bank sizes
The following values use a nominal internal battery voltage of 3.7V. The airline decision column reflects the FAA’s general capacity framework, not a guarantee that a specific airline will accept the power bank.
The table makes one important point clear: a 20,000 mAh model is usually easier to travel with than a 30,000 mAh model. The smaller charger has more room below the standard 100 Wh threshold.
Choose a capacity based on your travel needs
The best capacity depends on how many devices need charging and how long you will be away from a wall outlet.
TRAVEL POWER BANK FIT DASHBOARD
COMPACT FIT
10,000 mAh
Suitable for commuters carrying a smartphone or earbuds for a short journey.
Choose for lighter everyday carry.
BALANCED FIT
20,000 mAh
Useful for frequent flyers carrying several small electronics on longer journeys.
Choose for capacity and travel convenience.
NEAR THE LIMIT
27,000 mAh
Can provide substantial capacity, but the precise Wh label and airline limits deserve careful attention.
Choose only after verifying the specifications.
SPECIAL APPROVAL CATEGORY
30,000–40,000 mAh
These capacities often exceed 100 Wh at 3.7V and may not meet stricter airline policies.
Choose only with confirmed airline acceptance.
For most ordinary passengers, a reliable 10,000 or 20,000 mAh power bank offers a practical balance between portability and stored energy. Always use the actual Wh rating when deciding whether it is suitable for a flight.
For more portable power information, explore our power bank and portable charging guides.
What Mistakes Can Cause Airport Delays or Safety Problems?
A traveler may follow the correct capacity limit but still make a packing mistake that causes trouble during screening or boarding.
These are some common mistakes worth avoiding.
Mistake 1: Checking the mAh number but ignoring voltage
A power bank’s Wh rating depends on both its capacity and voltage. Using the wrong voltage can produce an incorrect result.
Better choice: Check the printed Wh rating first. If it is missing, use the manufacturer’s nominal battery voltage to calculate the energy accurately.
Mistake 2: Putting the charger in checked baggage
This is one of the most important rules to remember. A power bank is a spare battery, not an ordinary accessory that can simply be placed in a suitcase.
Better choice: Keep every power bank in permitted cabin baggage and remove it if your carry-on is transferred into the cargo hold.
Mistake 3: Assuming all airlines have identical restrictions
The FAA sets the federal baseline, but an airline may introduce additional requirements. Some carriers restrict how many power banks are permitted, the maximum individual capacity, and where they can be stored during the flight.
Better choice: Check every operating airline on the itinerary, including connecting flights.
Mistake 4: Ignoring in-flight power bank restrictions
Permission to carry a power bank does not automatically mean passengers can use it at every stage of the journey.
For example, Delta prohibits recharging power banks during flight and restricts their use to recharge other devices during taxi, take-off, and landing. Its policy also requires accessible storage rather than overhead-bin storage. American Airlines publishes its own restrictions on charging power banks from aircraft outlets and storing them during flight.
Better choice: Read the current in-flight rules instead of assuming your charger can be used throughout the journey.
WHEN TO CONTACT A PROFESSIONAL OR THE MANUFACTURER
Contact the manufacturer when battery specifications are missing, a device shows damage, or the charger behaves abnormally. Do not attempt to open, repair, or puncture a lithium-ion battery pack. Do not carry swollen, leaking, overheated, or recalled batteries on an aircraft. If a battery overheats, smokes, or catches fire during a flight, notify the cabin crew immediately.
Once an old or damaged power bank is no longer suitable for use, arrange proper rechargeable battery recycling. Follow the manufacturer’s instructions and use an appropriate battery recycling collection point rather than placing a damaged lithium-ion battery in household trash.
Travelers can also review the TSA What Can I Bring guidance for checkpoint information. The final decision at the checkpoint rests with the TSA officer.
Frequently Asked Questions About Power Banks on Flights
＋ Is a 20,000 mAh power bank allowed on a flight?
Generally, yes. A 20,000 mAh power bank at 3.7V equals approximately 74 Wh, which is below the FAA’s standard 100 Wh threshold. It must go in carry-on baggage and meet the operating airline’s additional requirements. Check the printed Wh rating before packing it.
＋ Is a 30,000 mAh power bank allowed on a plane?
It depends on its actual voltage and energy rating. At 3.7V, 30,000 mAh equals 111 Wh, placing it in the FAA’s 101–160 Wh category, which requires airline approval. Some airlines set a stricter 100 Wh maximum, so choose a smaller charger when acceptance cannot be confirmed.
＋ Can I put a power bank in checked luggage?
No. Spare lithium-ion batteries, including power banks, must be carried in cabin baggage under FAA rules. They cannot be placed in checked luggage. Keep the charger with you if your cabin bag is gate-checked.
＋ Can I bring two power banks on an international flight?
Many airlines permit two power banks, but quantity and capacity limits vary. The FAA’s general rules do not set a quantity limit for most personal-use spare batteries under 100 Wh, although airlines can impose stricter limits. Check every operating carrier and the destination country’s current rules before traveling.
＋ Is 100 Wh the same as 27,000 mAh?
Approximately. At 3.7V, 100 Wh equals about 27,027 mAh. However, the conversion changes with voltage, so the actual printed Wh rating or manufacturer’s battery specifications should guide your decision. Use the voltage of the internal battery cells, not the USB output voltage.
＋ Why do airlines restrict power banks during flights?
Power banks contain lithium-ion batteries that can overheat or experience thermal runaway if damaged or defective. Keeping spare batteries in the cabin makes it easier for trained crew members to respond to a battery emergency. Follow the airline’s storage and usage rules, and never pack a damaged charger.
＋ What should I do if my power bank does not show a Wh rating?
Use the manufacturer’s stated internal battery voltage and mAh capacity to calculate watt-hours. Check the manual or product specifications if information is missing from the casing. Contact the airline before departure if the capacity cannot be verified. Do not rely on an uncertain estimate for boarding approval.
＋ Can I charge my phone using a power bank during a flight?
This depends on the operating airline’s current policy. Some carriers restrict power-bank use or prohibit recharging the power bank itself using aircraft outlets. For example, Delta does not permit passengers to use power banks to recharge other devices during taxi, take-off, or landing. Check the carrier’s in-flight instructions before using yours.
For additional travel guidance, review the FAA PackSafe lithium battery instructions and the latest IATA passenger battery guidance, particularly when traveling internationally.
For more practical advice about portable chargers, capacity, charging safety, and travel-friendly gadgets, explore our rechargeable gadget and power bank resources.
Final Thoughts
Understanding how many mAh power banks are allowed on a flight makes travel preparation much easier. The most important number is not simply the advertised mAh capacity but the battery’s watt-hour rating.
For most U.S. passengers, a power bank rated at 100 Wh or less is the most straightforward option. At 3.7V, that is approximately 27,000 mAh. A 10,000 or 20,000 mAh model usually provides a convenient balance of stored energy and travel compatibility.
Before leaving home, check the power bank’s specifications, inspect its condition, confirm your airline’s capacity and quantity limits, and pack it in accessible carry-on baggage. Never assume that a battery accepted by one airline will automatically be accepted by another.
For damaged or overheating batteries, contact the manufacturer and do not attempt to repair the battery pack yourself. Always check the user manual, current airline requirements, and applicable travel rules before departure.
A properly selected and safely packed power bank can make a long journey more convenient without creating unnecessary airport problems.
