The power bank in your bag is now one of the most regulated items you travel with.
For years it was an afterthought. You threw it in a pocket, forgot about it, and nobody asked. That changed in March 2026, when the international guidance airlines work to was tightened significantly.
Most travellers have heard something vague about it. Fewer know what the guidance actually says, and a lot of the coverage has blurred two very different things: recharging the power bank itself, and using it to charge your phone.
This guide sets out what the international baseline requires, what it only recommends, and where national regulators and individual airlines go further.
The Quick Answer
Yes — in your carry-on only, never in checked baggage. The international baseline allows two power banks per passenger, up to 100 Wh without approval, 100–160 Wh with your airline's permission, and nothing above 160 Wh in the cabin. Recharging a power bank onboard is prohibited under that baseline; using one to charge a device is discouraged rather than banned outright. National regulators and individual airlines can be stricter, so your carrier's policy is the one that decides.
What Actually Changed in March 2026
From 27 March 2026, revised dangerous goods provisions for power banks took effect in the international guidance that airlines work to. The headline changes are a cap of two power banks per passenger, a prohibition on recharging them onboard, and confirmation that they are forbidden in checked baggage.
The watt-hour thresholds themselves are not new. What changed is the tightening around quantity and onboard behaviour.
The operative wording comes from the IATA guidance to operators, which sets out what carriers are working to.
Three Layers Decide What Applies to Your Flight
Almost every disagreement about power bank rules comes from treating these as one thing. They are not.
- The international baseline — the ICAO Technical Instructions and the IATA guidance built on them. This is what changed on 27 March 2026, and it is guidance to operators rather than law in itself.
- National implementation — each country's civil aviation authority writes those instructions into its own regulations, on its own timetable. Adoption is not simultaneous everywhere.
- Airline policy — carriers may impose stricter conditions than either, and many already do.
Where the three differ, the strictest one that applies to your flight is the one that counts. Everything below describes the baseline unless it says otherwise.
Can You Put a Power Bank in Checked Luggage?
No. Power banks are forbidden in checked baggage and must be carried in the cabin.
This one is not a grey area and it is not new, but it remains the most common mistake. The reason is straightforward: if a lithium cell fails in the hold, nobody is there to deal with it. In the cabin, crew can respond immediately.
If you are repacking at the gate because your carry-on is overweight, the power bank is the one item that cannot move into the bag being checked.
How Many Power Banks Can You Take on a Plane?
Two per person under the international baseline — and some airlines allow only one.
For most travellers this is not a constraint. It becomes one for photographers, content creators and anyone who has quietly accumulated a small collection of batteries for different devices. If that is you, the practical answer is to consolidate into fewer, better-chosen units rather than carrying five half-charged ones.
Our guide to what power bank capacity you actually need is a useful starting point if you are deciding which two to keep.
What the Watt-Hour Limits Mean in Practice
Watt-hours (Wh) measure total energy, and that is what aviation rules are written around — not the mAh figure printed in large type on the box.
| Capacity | What you need to do | Typical devices |
|---|---|---|
| Up to 100 Wh | Carry on — baseline allows two | Almost all consumer power banks |
| 100–160 Wh | Airline approval required before you fly | Large laptop banks, some pro batteries |
| Above 160 Wh | Not permitted in the cabin | Camera, drone and portable power stations |
Converting mAh to watt-hours
Most power banks advertise mAh. The conversion is straightforward:
Wh = (mAh ÷ 1000) × voltage. Most lithium cells run at a nominal 3.7 V.
So a 20,000 mAh bank is roughly 74 Wh, comfortably inside the limit. A 27,000 mAh bank lands at around 100 Wh, right on the threshold. If your battery is rated above about 27,000 mAh, check the printed Wh figure before you travel rather than assuming.
Most power banks carry the watt-hour rating printed on the casing. If you cannot find a Wh figure anywhere on yours, that is a reason to leave it at home — crew have no way to assess it, and an unmarked battery is the easiest one to have refused.
Can You Use a Power Bank During the Flight?
This is where most summaries get it wrong, and the distinction matters.
Recharging the power bank itself is prohibited. You cannot plug it into the aircraft's USB port or seat power to top it up. The baseline states this as a requirement rather than a suggestion, and airlines apply it.
Using it to charge your phone is a different matter. The same guidance says power banks should not be used to charge devices onboard — worded as a recommendation rather than an absolute prohibition. Several airlines have gone further and banned it outright on their aircraft.
In practice this means the answer depends on who you are flying with, and the safe assumption is that you will not be using it in the air at all. Plan your travel day so you do not need to.
Why Individual Airlines Go Further Than the Baseline
Common additions include limiting passengers to a single power bank, requiring the unit to stay visible in a seat pocket rather than in the overhead bin, requiring the capacity marking to be legible, and banning onboard use of any kind.
Because these vary carrier by carrier, check your airline's dangerous goods page before you fly — particularly on long-haul routes, or when connecting between carriers with different policies.
How to Pack a Power Bank So It Stays Compliant
The rules are easier to follow when your bag is organised for them. A power bank buried under clothing is the one you cannot produce when asked.
- Keep it in your carry-on, never in a bag you might end up checking.
- Store it where you can reach it from your seat, not in the overhead bin.
- Protect the terminals so it cannot short against keys or coins — the original case, a dedicated pocket, or a sleeve.
- Keep the capacity marking visible rather than covered by stickers or tape.
- Carry it charged before you leave, since you will not be topping it up in the air.
A dedicated pouch handles most of this without thinking about it. The GearApt™ Travel Tech Organizer keeps batteries, cables and adapters separated in one place you can pull out at security or from under the seat, which is exactly the behaviour the current rules push towards.
If you want the wider system, see how to organise your travel tech before a flight.
What This Means for How You Charge on a Travel Day
If in-flight power bank use is off the table, the charging happens on the ground — and that shifts where the effort goes.
A long travel day works better when you arrive with everything full, use gate and lounge outlets rather than saving the bank for the plane, and treat it as cover for the transit at the other end instead of for the flight itself.
That makes a capable wall charger more useful than it used to be. The GearApt™ Global Power Hub covers multiple devices from one socket, which matters when you are sharing a single outlet at a gate. Our travel charging checklist covers the rest of the setup.
FAQ
Can I bring a power bank in my checked suitcase?
How many power banks can I take on a plane?
Is a 20,000 mAh power bank allowed on a flight?
Can I charge my phone from a power bank during the flight?
What happens if my power bank has no watt-hour rating printed on it?
Final Thoughts
None of this makes power banks difficult to travel with. Two units, in your carry-on, within 100 Wh, charged before you board and kept where you can reach them covers almost every traveller.
The part worth internalising is the split between what is required and what is merely advised, because that is where airlines differ. Recharging onboard is prohibited under the baseline and carriers apply it. Whether you can use the bank in the air depends on who you are flying with.
Rules in this area have moved more than once, national adoption is still catching up, and individual airlines continue to tighten their own. Check your carrier's current policy before a long trip rather than relying on what was true last year.