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Yes—usually. A 25,000mAh power bank is about 92.5Wh when its cells are rated at the common nominal voltage of 3.7V, which is below the 100Wh baseline used in U.S. passenger guidance. The number printed in mAh is not enough by itself, however: read the bank’s Wh marking, carry it in the cabin rather than checked baggage, protect it from short circuits and damage, and verify the operating airline’s current quantity and onboard-use rules before you leave.
What a 25,000mAh power bank equals in airline terms
Airline battery limits are expressed in watt-hours (Wh), not just milliamp-hours (mAh). To convert the capacity, first change milliamp-hours to amp-hours, then multiply by the battery’s nominal voltage:
25,000mAh ÷ 1,000 = 25Ah
25Ah × 3.7V = 92.5Wh
That 92.5Wh figure is a calculation based on a 3.7V nominal cell voltage. It is not a substitute for the product’s printed rating. Power banks can use different cell specifications, and the airline or airport may rely on the Wh value marked on the case or in the manufacturer’s documentation. If the label gives Wh, use that number. If it gives only mAh, use the actual nominal voltage shown for that model rather than assuming 3.7V.
The Federal Aviation Administration (FAA) treats lithium-ion batteries at or below 100Wh as the normal passenger category. Its passenger guidance describes a separate 101–160Wh allowance for certain spare lithium-ion batteries, but airline approval is required and airlines may set lower capacity or quantity limits. A power bank is a spare battery for carriage purposes, so do not assume that the FAA’s general 101–160Wh approval exception will be accepted for a power bank on every route.
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| What you see | How to interpret it | Action |
|---|---|---|
| 25,000mAh and 3.7V nominal | Approximately 92.5Wh | Normally within the 100Wh category, subject to the marked rating and airline policy |
| A printed Wh value | The airline’s most useful capacity figure | Use the marked Wh value instead of a rough conversion |
| 101–160Wh | Above the usual baseline | Ask the operating airline for written confirmation; approval and quantity limits may apply |
| More than 160Wh, or an unverified rating | Not a routine passenger power-bank category | Do not take it to the airport without the carrier confirming carriage is permitted |
Why the mAh number can mislead
mAh describes electrical charge, while Wh describes energy. Voltage is the bridge between them, which is why two products with the same mAh headline can have different Wh ratings. A bank may also advertise the capacity of its internal cells while the USB output delivers less usable energy after voltage conversion. Airline screening is concerned with the battery’s energy rating, not how many phone charges a marketing page promises.
Use the capacity printed on the battery case whenever possible. If the case, manual, and retail packaging show different values, do not pick the most favorable number. Keep the documentation with you and ask the manufacturer or operating airline to resolve the discrepancy before departure. An airport agent must be able to verify the rating; a personal calculation cannot overcome an unreadable or missing label.
Can you take a 25,000mAh power bank on a plane?
In the United States, a power bank with a verified rating of 100Wh or less is generally allowed as a spare lithium-ion battery, but it must be in carry-on baggage. The FAA says spare lithium batteries, including power banks and portable chargers, cannot be checked. The Transportation Security Administration’s passenger guidance follows the same carry-on-only treatment.
The practical answer is therefore conditional: a correctly labeled 25,000mAh bank that really falls below 100Wh is commonly acceptable in the cabin, while the airline operating your flight has the final operational requirements. This matters for international itineraries and connections because a different carrier, country, or aircraft operator may apply a stricter rule.
For 2026, the International Air Transport Association (IATA) operator guidance lists a maximum of two power banks per passenger when each is at or below 100Wh. In the same table, power banks greater than 100Wh through 160Wh are marked “Forbidden.” That operator guidance is more restrictive than the FAA’s general statement about airline-approved 101–160Wh spare batteries. Treat the airline’s current power-bank policy—not a generic internet summary—as the controlling instruction.
Check the label before packing
1. Find the Wh marking
Inspect the power bank itself, not only the retail box. Look for a line such as “Wh,” “watt-hours,” or a battery specification panel. IATA says the Wh rating should be marked on the battery case; an operator may refuse carriage if airport staff cannot verify the rating from the battery or supporting documentation.
2. Calculate only when necessary
If no Wh value is printed, use the FAA conversion: Wh = volts × amp-hours. Divide mAh by 1,000 to obtain Ah. For this example, 25,000mAh becomes 25Ah; at 3.7V nominal, that is 92.5Wh. If the model lists another nominal voltage, multiply by that voltage instead.
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Some products advertise a large mAh figure for internal cells but show a different usable output capacity. Airline limits concern the battery’s energy rating, not the phone-charging capacity you expect at a USB port. When the case, manual, and packaging disagree, contact the manufacturer and the airline before travel. Do not rely on a handwritten calculation if staff cannot verify the underlying voltage.
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4. Photograph the specification
A clear photograph of the rating label and a saved copy of the manufacturer’s specification can help if the printed text is small. Documentation supports verification; it does not make an above-limit power bank eligible. Keep the original label visible rather than covering it with tape, stickers, or a decorative sleeve.
Pack it in the cabin, never in checked baggage
- Put the power bank in your personal item or carry-on. Keep it accessible rather than buried in a suitcase that may be taken away at the gate.
- Do not place it in checked baggage. Spare lithium batteries are prohibited in the aircraft hold under FAA passenger guidance.
- If staff gate-check your carry-on, remove the power bank first. Keep it with you in the cabin, along with any other spare batteries.
- Keep the rating visible. Leave the printed label readable and carry the manual or product documentation if the Wh value is not obvious.
Gate-checking is the situation travelers most often overlook. A bag that started as cabin baggage can be transferred to the hold at the aircraft door because of space or weight. Before handing it over, open the bag and take out every power bank and other spare battery. Do not assume the airline will retrieve the item once the bag is tagged.
A protective pouch can make packing easier, but it does not change the bank’s Wh rating or make an otherwise prohibited battery acceptable.
Prevent short circuits and physical damage
A power bank’s exposed contacts can heat rapidly if they touch metal objects. IATA and the FAA advise protecting spare batteries against damage and short circuit. Use one of these approaches:
- Keep the bank in its original retail packaging.
- Place it in an individual protective pouch.
- Cover exposed terminals with non-conductive tape.
- Store it in a separate pocket away from coins, keys, loose cables, and other metal items.
- Do not pack it where it can be crushed, bent, punctured, or soaked.
Protection should be individual: do not let two loose banks rub against each other or let a bank share a pocket with metal objects. A pouch is optional, but the underlying requirement is preventing contact, impact, and damage. It is a containment and organization measure, not a repair and not an exemption from capacity limits.
Do not travel with a swollen, cracked, leaking, dented, unusually hot, or recalled power bank. A damaged battery can spark or overheat even when it is not connected to a device. Do not attempt to flatten, open, or repair it for the trip.
How the FAA and IATA rules fit together
The FAA’s passenger page provides the U.S. federal baseline: lithium-ion batteries at or below 100Wh are generally permitted, while spare batteries from 101Wh through 160Wh may be allowed with airline approval, limited to two. The FAA also expressly warns that individual airlines can impose stricter limits on both Wh and quantity, including limits on power banks regardless of their capacity.
IATA’s 2026 operator table applies a more specific rule to power banks: no more than two per passenger at or below 100Wh, with power banks over 100Wh and through 160Wh marked “Forbidden.” Because the documents address overlapping but not identical categories, do not use the FAA approval language as a universal permission slip. The operating airline’s policy governs the practical decision.
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IATA’s passenger document says it is based on the 2025–2026 ICAO Technical Instructions and the 67th edition (2026) of the IATA Dangerous Goods Regulations. The separate operator document is dated 31 March 2026 and says its guidance is not effective beyond 31 December 2026. Rules can be revised, so check the carrier’s page close to departure even if you have flown with the same bank before.
Confirm the operating airline’s rules
Check the carrier that actually operates each flight segment, including a codeshare or a connection on another airline. Look for the carrier’s current dangerous-goods, lithium-battery, or power-bank page and note:
- the maximum Wh per power bank;
- the maximum number allowed per passenger;
- whether approval is required for any battery above 100Wh;
- whether the airline bans use or charging during flight;
- any special packaging, inspection, or accessibility requirement.
Save the relevant page or confirmation with your travel documents. If the airline requires approval, obtain it before arriving at the airport; an informal statement from a different carrier or an old booking email may not apply. Check return and connecting segments separately because acceptance on the outbound flight does not guarantee acceptance later.
For U.S. travel, FAA passenger guidance is the relevant federal baseline. Apply any stricter airline, airport, or route requirement rather than trying to reconcile rules in your favor.
What you may do with it onboard
Under IATA’s 2026 operator guidance, do not recharge a power bank during the flight. The guidance also says it should not be used to recharge another portable electronic device onboard. That means you should board with the bank charged if you need it at your destination, then leave it stored and unused unless the operating crew gives a different instruction consistent with the airline’s policy.
Do not connect the bank to a seat outlet, USB port, or another charger. Do not connect a phone or laptop to the bank for an onboard recharge under that guidance. Airport charging before boarding is the safer time to prepare it, subject to the bank’s normal manufacturer instructions.
Air-crew instructions take priority. If a crew member asks you to disconnect, stow, or hand over a battery, follow that instruction immediately. Never leave a power bank connected to a charger unattended in a seat pocket or overhead compartment.
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What to do if the battery overheats or is damaged
Before leaving home
Inspect the casing, ports, cable, and buttons. A bank that is swollen, cracked, leaking, burned, or recalled should stay home. Do not attempt to flatten, open, or repair a lithium battery for travel.
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At the airport
If security or airline staff cannot verify the Wh rating, be prepared for the item to be refused. Do not put it into checked luggage as a workaround. Ask the carrier what disposal or return options are available. A refusal at screening is not changed by transferring the bank to another bag.
During the flight
If the bank becomes hot, emits an odor, swells, smokes, sparks, or is damaged, alert the cabin crew immediately. Do not hide it, place it in an overhead bin, or pour liquid on it unless crew direct you to do so. The crew has procedures for a suspected lithium-battery event.
Common trip scenarios
You have one labeled 92.5Wh bank
Keep it in your carry-on, protect it individually, and confirm the airline’s quantity rule. Under the FAA baseline it is within the normal category, but the operating carrier still controls acceptance.
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You have three small power banks
Capacity alone is not enough. IATA’s 2026 operator table allows a maximum of two power banks at or below 100Wh per passenger. Ask the airline whether its own limit is lower before packing three.
The bank says 25,000mAh but has no Wh label
Calculate from the marked nominal voltage and carry supporting documentation. If staff cannot verify the rating from the item or documents, the operator may refuse carriage.
Your carry-on is taken at the gate
Remove the power bank before the bag enters the hold. Keep it in a personal item or otherwise with you in the cabin.
You are changing airlines
Review every operating carrier’s current rule, including the return flight. A rule that permits the bank on one segment may not apply to another.
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IATA passenger information reports that 83% of surveyed travelers carry a phone, 60% bring a laptop, and 44% travel with a power bank. The same page reports that half of respondents incorrectly believe small lithium-powered devices can go in checked baggage; 45% think power banks can be placed in the hold; and 33% are unsure about limits for larger batteries or spare power banks. The page does not state the survey year, so these figures should be read as an indication of passenger confusion, not a dated trend.
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The confusion usually comes from mixing three different questions: the battery’s energy rating, where it may be packed, and whether it may be used or charged in flight. A 25,000mAh label answers none of those questions by itself. Checking Wh, baggage location, airline quantity limits, and onboard restrictions separately prevents the most common mistakes.
A departure-day checklist
- Read the Wh marking on the power bank.
- If necessary, calculate Wh from the bank’s stated nominal voltage; do not assume 3.7V unless that is the listed voltage.
- Resolve conflicting case, manual, and packaging figures before leaving home.
- Confirm that the operating airline accepts the capacity and quantity for every segment.
- Pack the bank in carry-on baggage, never checked baggage.
- Remove it before a carry-on is gate-checked.
- Protect it individually from terminals touching metal and from crushing or puncture.
- Do not bring a damaged, swollen, leaking, hot, or recalled unit.
- Keep the label and supporting documentation available.
- Do not recharge the power bank onboard, and do not use it to charge another portable device under the IATA 2026 operator guidance.
- Tell cabin crew immediately about heat, smoke, sparks, odor, swelling, or other damage.
The safe decision for a 25,000mAh bank
If the bank’s marked rating is 100Wh or less—and the 25,000mAh figure is backed by a nominal voltage that produces roughly 92.5Wh—it is normally a cabin-carried spare battery under the FAA baseline. Pack it where you can access it, protect the terminals, and remove it from any bag taken at the gate. Do not infer permission from mAh alone, and do not rely on the FAA’s 101–160Wh approval language for a power bank without the operating airline confirming that it applies. The airline’s current rule and the crew’s instructions control your journey.
Frequently Asked Questions
Can I take a 25,000mAh power bank on a plane?
Usually, if its verified rating is 100Wh or less. At 3.7V nominal, 25,000mAh calculates to about 92.5Wh. Check the printed Wh value and the operating airline’s current rules.
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No. FAA passenger guidance treats power banks as spare lithium batteries that must be carried on. Remove one from a carry-on if the bag is gate-checked.
How many power banks can I carry?
IATA’s 2026 operator table allows up to two power banks per passenger when each is at or below 100Wh. Your airline may impose a stricter limit.
What if my power bank is between 101Wh and 160Wh?
Do not assume it is permitted. The FAA describes an airline-approval exception for some spare lithium-ion batteries, while IATA’s 2026 power-bank table marks that category forbidden. Ask the operating airline directly.
Is mAh enough to prove a power bank is allowed?
No. Use the marked Wh rating. If Wh is missing, calculate it from the bank’s actual nominal voltage and carry documentation that lets staff verify the result.
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Can I charge my power bank during the flight?
IATA’s 2026 operator guidance says not to recharge a power bank onboard and advises against using it to charge another portable device onboard. Follow the operating crew’s instructions.
Should I buy a protective pouch?
A pouch is optional but useful for individual protection. Original packaging, terminal insulation, or a separate pocket can also prevent short circuits. A pouch does not change the Wh rating.
What should I do if it becomes hot or starts smoking?
Notify cabin crew immediately. Do not hide it or place it in an overhead bin. Do not travel with a bank that is already swollen, cracked, leaking, damaged, or recalled.
The Bottom Line
Bottom line: A labeled 25,000mAh bank is about 92.5Wh at 3.7V and is commonly allowed in carry-on baggage, not checked luggage. Verify the actual Wh marking, protect it from damage and short circuits, remove it from any gate-checked bag, confirm every operating airline’s quantity rule, and do not recharge or use it onboard under IATA’s 2026 operator guidance.
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