The rules that decide whether a power bank can be carried by air are written in watt-hours, and they apply to the lithium cells inside the pack rather than to the pack as an appliance. Three thresholds cover almost every journey in the world, and the practical difference between them is whether prior permission is required.
The three thresholds
| Rated energy | Cabin | Checked baggage |
|---|---|---|
| Under 100 Wh | Permitted, no approval | Not permitted |
| 100–160 Wh | Permitted with the airline's consent | Not permitted |
| Above 160 Wh | Not permitted | Not permitted |
Most current products print both figures. Where only milliamp-hours are shown, watt-hours can be approximated by multiplying the milliamp-hour rating by the cell voltage and dividing by a thousand: a 20,000 mAh pack at 3.7V is about 74 Wh. Capacities of 27,000 mAh and above cross the 100 Wh line and move the pack into the band that needs consent.
Why a power bank cannot be checked in
A lithium cell that fails in a pressurised cargo hold, where nobody is present and no suppression system reaches it, is the scenario the rule exists to prevent. Power banks therefore travel in the cabin, in hand baggage or on the person, where a fault can be noticed and dealt with. The same logic underpins the treatment of the terminals: a loose pack in a bag with keys or coins can short across its own contacts, so a covered port or a protective pouch is required by most carriers. Packs with an exposed terminal and no protection are the most common item removed at security.
Where airline policy goes further
- Consent for 100–160 Wh packs is a procedure, not a formality. It is usually arranged through the airline's contact centre or at check-in, and the pack must be presented. Confirm it in advance, in writing, and keep the confirmation.
- Quantity limits are set by the airline rather than by regulation. Two or three spare packs is a common limit, and the count varies between carriers and between cabins.
- Charging on board may be restricted. Several carriers prohibit using a power bank to charge a device in flight, or prohibit charging the pack itself from an in-seat socket, even where the pack is otherwise permitted.
- Destination countries add their own rules. A pack acceptable on departure may be refused on arrival, and the airline applies the more restrictive of the two.
Preparing a pack for a flight
- Identify the watt-hour figure on the case. Where it is illegible or absent, expect the pack to be questioned regardless of its actual capacity.
- Charge it to roughly half. A fully charged pack is not a compliance problem, but a fully depleted one may be refused by some carriers as unverifiable.
- Carry it in hand baggage or a pocket, not in a bag that will be checked at the gate.
- Cap or tape the ports, or carry the pack in a pouch, so the contacts cannot short.
- Keep the pack where it can be produced on request, since security staff may ask to see it even where no approval is required.
Where to start
- Flying with a power bank — the rules read in full, with the reasoning behind the cabin-only requirement.
- Power bank buying guide — how to compare rated and usable capacity before choosing a pack.
- Best power banks in 2026 — which capacities stay under 100 Wh and which need the airline's consent.
Where to buy a airline-approved power bank
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