Keep a power bank with you in the cabin, never in checked baggage. Before heading to the airport, check its watt-hour rating, protect its terminals and confirm your airline’s current rules. This guide concerns power banks; batteries installed in mobility equipment or other devices need their own checks.
Before you leave for the airport
- Find the capacity printed on the power bank. If it is missing or unreadable, ask your airline how to proceed before traveling.
- Protect the terminals against short circuits, for example with insulating tape or individual protective bags.
- Keep the power bank in your personal possession. Do not pack it in a bag you intend to check; if a carry-on must be checked at the gate, remove the power bank first.
- Check the policy for every operating airline on a connecting itinerary. Rules at other airports and destinations may differ.
Capacity and quantity
Incheon’s Korean-language carry-on rules list a maximum of two power banks per person up to 160 Wh, with airline approval required above 100 Wh and up to 160 Wh. A power bank over 160 Wh cannot be carried. The airport’s May 2026 announcement describes the rules effective April 20, 2026. Confirm the current airline rule before departure.
| Marked capacity | Practical next step |
|---|---|
| Up to 100 Wh | Check the two-power-bank maximum and any stricter airline rule. |
| Above 100 Wh to 160 Wh | Obtain the operating airline’s approval in advance; the maximum is two. |
| Above 160 Wh | Do not bring it on the aircraft. |
| No readable rating | Ask the airline before going to the airport; do not guess. |
Incheon’s English battery page describes capacity restrictions, but its general wording is less specific about power-bank quantity than the newer Korean notice. Use the current specific notice and check with the airline rather than assuming the older general wording is the whole rule.
What if the label only shows mAh?
Watt-hours require the battery’s nominal voltage, not merely the USB output voltage. Calculate Wh = mAh × V ÷ 1,000. For example, a 20,000 mAh battery with a stated nominal voltage of 3.7 V is 74 Wh. This is arithmetic, not approval to fly: take the product documentation or a legible manufacturer label and ask your carrier if the rating is unclear.
At the gate and on board
The airport’s 2026 notice says not to charge or use a power bank in flight and not to store it in an overhead bin. Follow the crew’s instructions and your airline’s current policy. Keep it accessible when bags are weighed or gate-checked.
Next: confirm your flight’s terminal and baggage check-in steps on the Incheon baggage guidance, then review your airline’s baggage rules for the rest of your equipment.