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Yes—most power banks can fly, but they must stay in your carry-on. Under U.S. passenger rules, a spare lithium battery up to 100 watt-hours (Wh) is generally allowed, a 101–160 Wh spare lithium-ion battery needs airline approval and is limited to two per passenger, and anything over 160 Wh is forbidden on passenger aircraft. A power bank’s watt-hours, not its milliamp-hour number alone, determine which limit applies.
The short answer: pack power banks in your cabin bag
Transportation Security Administration (TSA) guidance treats a power bank as a spare, uninstalled lithium battery. That means it belongs in carry-on baggage, not checked baggage. The same rule applies to spare rechargeable lithium-ion batteries and phone-charging cases. The Federal Aviation Administration (FAA) also requires spare lithium batteries to remain with the passenger in the cabin.
If an airline takes your carry-on at the gate to place it in the aircraft hold, remove the power bank and every other spare battery first. Keep those batteries with you in the cabin. A battery that was legal in your carry-on does not become legal simply because the bag is gate-checked.
These are U.S. TSA and FAA passenger rules. The airline operating your flight can impose stricter capacity, quantity or packaging limits, and another country’s rules may differ. Check the operating airline’s current dangerous-goods page before leaving for the airport.
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Official references: TSA’s What Can I Bring list and the FAA Airline Passengers and Batteries guidance.
Understand the 100 Wh, 160 Wh and two-battery limits
The FAA measures rechargeable battery energy in watt-hours (Wh). The thresholds apply to each battery, not to the combined capacity of all your devices.
| Battery capacity or situation | U.S. passenger guidance | What to do |
|---|---|---|
| 0–100 Wh spare lithium-ion battery or power bank | Generally allowed in passenger baggage, but a spare must be in carry-on baggage. | Keep it in the cabin and prevent damage or a short circuit. |
| 101–160 Wh spare lithium-ion battery | Allowed only with the operating airline’s approval. No more than two spare batteries in this range per passenger. | Obtain approval before travel and carry the batteries in the cabin. |
| More than 160 Wh | Forbidden on passenger aircraft. | Do not put it in carry-on or checked baggage. |
| Spare lithium-metal battery | TSA lists a maximum of 2 grams of lithium per battery. Spare units remain carry-on only. | Confirm the chemistry and lithium content on the label, then check the airline’s policy. |
| Battery installed in a device | Handled differently from a spare. FAA conditions can allow some completely powered-off devices in checked baggage, subject to capacity and protection requirements. | Carry the device in the cabin when practical and follow the FAA and airline packing conditions. |
The 101–160 Wh allowance is conditional, not an automatic right to board. Airline approval is required, and an airline may set a lower limit or refuse a particular battery.
How to convert mAh to Wh
Milliamp-hours (mAh) describe charge capacity, while watt-hours account for both capacity and voltage. Because manufacturers can quote mAh at different voltages, two batteries with the same mAh figure can have different energy ratings.
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Use the FAA formula
Wh = volts (V) × amp-hours (Ah)
Convert milliamp-hours to amp-hours by dividing by 1,000:
Ah = mAh ÷ 1,000
The FAA gives this example: 12 V × 8 Ah = 96 Wh. That battery falls below the 100 Wh threshold for a spare lithium-ion battery, although it still must travel in carry-on baggage and meet the airline’s requirements.
Example: a 20,000 mAh power bank
A 20,000 mAh figure converts to 20 Ah. If the stated cell voltage is 3.7 V, the arithmetic is:
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3.7 V × 20 Ah = 74 Wh
On that calculation, the battery is below 100 Wh. This is an illustration of the FAA formula, not a certification of any particular product. Power banks may print capacity at cell voltage, USB output voltage or another test condition. Use the manufacturer’s printed Wh rating whenever one is available. If the label is unclear or contradictory, ask the manufacturer or the airline rather than relying on an assumed voltage.
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Why mAh alone cannot answer the question
- A mAh number without voltage is incomplete for an airline-capacity decision.
- Output conversion circuitry means the usable USB capacity is not the same as the battery’s stored energy.
- Marketing labels may show a nominal cell capacity instead of the Wh value used for transport rules.
- Do not infer that every 20,000 mAh, 26,800 mAh or 30,000 mAh power bank has the same Wh rating.
Find the Wh marking first. If only V and mAh are printed, perform the conversion and keep a clear photo of the label in case an airline agent asks how you obtained the figure.
Protect spare batteries from short circuits and damage
The FAA states: “Battery terminals (usually the ends) must be protected from short circuit (i.e., the terminals must not come in contact with other metal).” This is a safety requirement, not merely a suggestion for tidy packing.
For a loose battery, the FAA identifies several acceptable protection methods:
- Leave the battery in its original retail packaging.
- Cover exposed terminals with non-metallic tape.
- Place each battery in a battery case or sleeve.
- Use a separate snug plastic bag or other protective pouch.
Do not let loose batteries share an unprotected pocket with coins, keys, charging cables with metal ends or other conductive objects. Keep the battery dry, prevent crushing, and do not pack a swollen, punctured, leaking or otherwise damaged battery. For the complete terminal-protection guidance, see FAA PackSafe — Batteries.
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Carry-on, checked baggage and gate-check decisions
Carry-on baggage
Place power banks and spare lithium batteries where you can remove them quickly for inspection. A small pouch in the cabin bag is easier to inspect than a deeply packed compartment. Keep the battery switched off when it has a power button, and do not use a damaged unit.
Checked baggage
TSA lists power banks and phone chargers as prohibited in checked baggage. Spare uninstalled lithium-ion and lithium-metal batteries also remain carry-on only. Do not try to satisfy the rule by putting a power bank inside checked luggage while leaving its cable in your personal item.
When your carry-on is checked at the gate
Before handing over the bag, remove every spare battery and power bank. FAA guidance requires those spares to remain with you in the cabin. Ask the gate agent where to place them if your personal item is already full; never leave them inside the bag entering the hold.
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Do not confuse a spare battery with a battery installed in a device
A power bank is designed to be used outside the device it charges, so it is a spare battery for transport purposes. A battery sealed inside a phone, tablet, camera or laptop is an installed battery and follows a different set of conditions.
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The FAA allows some devices with installed lithium batteries in checked baggage only when they are completely powered off and protected against accidental activation and damage, and capacity restrictions still apply. Airlines can prohibit checked electronic devices or impose additional conditions. Carrying phones, tablets and laptops in the cabin avoids the gate-check and handling problem and lets you respond if security staff need the device powered on.
Never use the installed-device exception to justify checking a separate power bank. The exception concerns the device containing the battery; it does not turn an uninstalled spare into a checked-bag item.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.TSA screening is separate from airline approval
TSA officers screen baggage for transportation security. The FAA and Department of Transportation rules address the safe transport of hazardous materials, while the airline controls its own approval process and may apply stricter limits. A battery can satisfy the published Wh threshold and still require a carrier decision or additional screening.
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TSA warns that an item may receive additional screening or be refused for a security concern, and the final checkpoint decision rests with the TSA officer. Treat the published allowance as a framework, not a guarantee that every unlabeled or unusual battery will pass inspection.
For a 101–160 Wh spare lithium-ion battery, contact the airline operating the flight before travel, obtain its approval in the form it requests, and carry proof of that approval. If your itinerary includes connections, verify the rules for every operating carrier rather than only the company that sold the ticket.
Common situations and the correct response
| Your situation | Correct response |
|---|---|
| The power bank label says 74 Wh. | Pack it in carry-on baggage, protect it from short circuit and follow the airline’s quantity rules. |
| The label says 120 Wh. | Ask the operating airline for approval. Carry no more than two spare lithium-ion batteries in the 101–160 Wh range per passenger. |
| The label says 180 Wh. | Do not take it on a passenger aircraft; FAA guidance forbids batteries over 160 Wh. |
| The label gives only 20,000 mAh. | Find the voltage and calculate Wh, or obtain the manufacturer’s Wh rating. Do not decide from mAh alone. |
| Your carry-on may be gate-checked. | Remove all power banks and spare batteries before the bag enters the aircraft hold. |
| A loose battery has exposed contacts. | Use original packaging, non-metallic tape, a battery case or a separate protective pouch. |
| The battery is swollen or damaged. | Do not fly with it. Isolate it safely and follow local battery-disposal or hazardous-material advice. |
A pre-departure checklist
- Read the battery label and record the printed Wh value, voltage, chemistry and quantity.
- If Wh is missing, convert V × (mAh ÷ 1,000), then verify the result with the manufacturer when the label or voltage is ambiguous.
- Put every power bank and spare battery in carry-on baggage, never checked baggage.
- Protect terminals individually with retail packaging, non-metallic tape, a sleeve, case or snug protective pouch.
- For a 101–160 Wh spare lithium-ion battery, obtain the operating airline’s approval and confirm that you have no more than two in that range.
- Check every operating carrier and every country on the itinerary for stricter rules.
- Before any gate-check, remove the batteries and keep them with you in the cabin.
- At security, be ready to present the label and comply with additional screening or the TSA officer’s instructions.
What to verify when a label is missing or unclear
An unlabeled battery is difficult for both an airline and a checkpoint officer to classify. Look for a manufacturer specification that states voltage, amp-hours and watt-hours; do not estimate from the product name. If the manufacturer cannot provide a reliable rating, contact the airline before arriving at the airport. The airline can tell you whether it will accept the battery and what documentation it requires, but it cannot authorize a battery above the FAA’s 160 Wh passenger limit.
Rules and airline policies can change. Recheck the FAA passenger guidance, the TSA list and your operating airline’s instructions close to departure.
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