Passport, charging cable, three power banks. That packing list sounds reassuring, but pause at the last item. Power banks are not travel snacks where an extra helping simply brings comfort. Quantity, capacity, packaging and cabin behaviour each need a separate check.
Information checked September 25, 2026, at 19:06 KST. A power-bank-related aircraft fire report appeared among Channel A’s most-viewed stories on Naver today. It prompted this practical guide to passenger rules, rather than speculation about the cause. Story used for topic research
Key points
- Under Korea’s rules effective April 20, 2026, the maximum is two power banks per passenger. More than 100Wh and up to 160Wh requires airline approval.
- Permission to carry a power bank does not permit using or charging it on board. Keep it out of checked baggage and overhead bins.
- Check the Wh label and condition, protect each battery against short circuits, and check the operating airline for every flight, including connections.
1. If a guide says five, check its effective date
Korea’s transport ministry announced a limit of two power banks per passenger, each no larger than 160Wh, from April 20, 2026, with on-board use and charging prohibited. The previous allowance of five units at 100Wh or below should not guide current packing. Ministry’s April notice Independent reporting confirms the change and timing. Yonhap report
Trinity Airways’ notice effective April 20 specifies advance approval for more than 100Wh and up to 160Wh, and no carriage above 160Wh. Do not read this as permission for two small units plus two large ones. Total quantity and each unit’s capacity are separate conditions. Airline’s revised notice
This guide focuses on the Korean implementation. Do not assume every overseas domestic flight or connection applies identical rules: check the latest guidance from the operating carrier for each leg. On a codeshare, the airline selling the ticket can differ from the one operating the aircraft.
Power banks need a departure check too
Check capacity, quantity, packaging and storage separately.
- 01Read the Wh labelAbove 100Wh: check approval first
- 02Two at mostKorean rules effective April 20, 2026
- 03Protect individuallyInsulate terminals or use individual protective packaging
- 04Keep within reachNo checked bags, overhead bins, use or charging
2. Does a 65W label mean less than 100Wh?
W measures power; Wh measures stored energy, so the numbers cannot be compared directly. Think of the flow from a tap versus the size of a water tank. Even if 65W is printed prominently, find the battery’s capacity label separately.
The US Federal Aviation Administration explains Wh as voltage in V multiplied by capacity in Ah; divide mAh by 1,000 to obtain Ah. Look first for the Wh rating printed on the product. FAA capacity guidance
Hypothetical label calculation: if 20,000mAh and a nominal battery voltage of 3.7V describe the same battery capacity, 20,000 ÷ 1,000 × 3.7 = 74Wh. This does not guarantee that a particular product will be accepted. Do not substitute a USB output voltage or memorise “20,000mAh always passes”. If markings are worn away or several incompatible figures appear, ask the airline using the manufacturer’s information and a photograph of the product.
3. Check the suitcase, but remove the power bank
Power banks do not belong in checked baggage. A particularly easy moment to miss is when a cabin bag is checked at the gate. The FAA also instructs passengers to remove power banks then and keep them in the cabin. FAA baggage guidance
Prepare individual protection. Korean Air lists insulating terminal tape, a separate zip bag for each battery, or an individual protective pouch. Its guidance says to keep them on your person or in the seat pocket, rather than an overhead bin. The five-unit allowance still shown in this January notice predates April’s revision; we use it here only for packaging and storage. Korean Air packaging and storage guidance
Instead of dropping batteries into a miscellaneous pocket with keys and coins, organise them so they are easy to take out and inspect before boarding. Preparing packaging at home also avoids relying on the airport to supply it.
4. Permission to carry is not permission to charge
Avoid both connecting a power bank to your phone and recharging the power bank from seat power. Charging it inside a bag does not remove the prohibition. Check your phone’s charge before the flight and plan to preserve enough for maps, transport and calls after arrival.
Tell the crew immediately if a battery becomes unusually hot, swells or emits smoke. The FAA advises immediate reporting of these signs. Do not pack a damaged or recalled product merely because its capacity is small; check with the manufacturer and airline first. FAA warning signs and damaged-product guidance
5. A final checklist for real packing moments
This is an editorial checklist applying the rules above. It does not replace the separate rules for medical devices, mobility aids or all batteries installed in equipment.
| Situation | First action | Easy distinction to miss |
|---|---|---|
| You have three power banks | Select no more than two you need | Small units count too |
| You are packing a 120Wh unit | Ask the operating airline for advance approval | Below 160Wh is not automatic permission |
| Only 65W catches your eye | Find Wh and the nominal battery information | Power and energy capacity differ |
| Your bag is checked at the gate | Remove power banks first | Actual handling matters, not the bag’s original purpose |
| Your phone is low on the plane | Do not connect the power bank | Carrying and using have separate conditions |
Before departure, check “my flight, my battery, my packaging” together. The actual label and current carrier guidance are more useful than a saved screenshot of an old blog. Choosing and preparing no more than two suitable units is a small packing skill worth practising.