If you packed a power bank in your suitcase for an overseas trip, take it back out.
Power banks can’t go in checked baggage; they must be carried on board. On top of that, since 2026 major airlines have banned using them, charging with them and storing them in overhead bins during flights.
Since April 20, 2026, Korean Air has limited power banks to 160 Wh or less and two per person. You must keep them on you or in the seat pocket, with terminals covered in insulating tape or each one in its own zip bag or protective pouch.
Can You Bring 10,000 mAh and 20,000 mAh Power Banks?
Most phone power banks are under 100 Wh. For a 3.7 V product, the math works like this:
- Formula: capacity (mAh) ÷ 1,000 × voltage (V) = Wh
- 10,000 mAh × 3.7 V = 37 Wh
- 20,000 mAh × 3.7 V = 74 Wh
- 27,000 mAh × 3.7 V = 99.9 Wh
- 30,000 mAh × 3.7 V = 111 Wh
A 20,000 mAh power bank is usually under 100 Wh, so it’s fine in the cabin. A 30,000 mAh one can exceed 100 Wh depending on voltage and may need airline approval.
Under power bank rules, the Wh rating printed on the product matters most, so check it first. If the capacity or voltage label is worn off, it may be refused at security or boarding.
Where Should You Keep It?
Allowed:
- A small bag you carry
- The seat pocket in front of you
- A protective pouch within reach
Not allowed:
- Checked baggage
- Overhead bins
- Several power banks in one zip bag
- Exposed terminals
- Charging your phone with it in flight
Power bank rules aim to keep it where you can see it, since heat or smoke in an overhead bin may be noticed too late.
How to Pack Them
If you bring two power banks, use one zip bag per battery, not one bag for both.
Prevent short circuits in one of these ways:
1. Tape over the terminals with insulating tape
2. One clear zip bag per battery
3. One protective pouch per battery
Keep cables separate and don’t let keys or coins touch the terminals.
How Many for a Family?
Power bank rules apply per passenger, not per bag.
Under Korean Air’s rule from April 20, 2026, two adults and one child with a seat can each carry up to two. Still, it’s safer for parents to manage the child’s batteries.
Packing the whole family’s power banks into one bag may mean extra checks to confirm owners at security. Split them so no one exceeds the limit.
How to Charge Your Phone in Flight
Under the newer power bank rules, since January 26, 2026, airlines including Korean Air and Asiana have banned charging devices with power banks in flight. You can use seat USB or power outlets, but not every aircraft has them.
On long flights, charge your phone at the airport before boarding and switch to low-power mode.
Download videos for kids’ tablets and lower screen brightness. Check your airline’s aircraft information for seat power.
Do You Take It Out at Security?
Incheon Airport asks passengers to insulate power banks and place them in the security tray outside their bags. Extra checks take time, so arrive early.
Packing Order on Departure Day
1. Check capacity and the Wh rating
2. Check for swelling or damage
3. Tape over the terminals
4. Put each in its own zip bag
5. Keep them in an outer pocket of your carry-on
6. Take them out before security
7. Keep them in the seat pocket after boarding
Don’t bring these batteries:
- Swollen products
- Cracked or dented cases
- Products that get very hot
- Products with worn-off capacity labels
- Recalled products
- Products over 160 Wh
If a battery gets hot, smells, smokes or makes noise in flight, don’t stuff it deeper into a bag; tell the crew right away.
Pros and Cons
Benefits of the new power bank rules:
- Heat and fire are spotted faster
- Less risk of batteries shorting against each other
- Crew can respond quickly in an emergency
Downsides for travelers:
- Each battery must be packed separately
- No charging from power banks in flight
- You must charge before long flights
- You need to check each airline’s limits
FAQ
- Can I bring a 20,000 mAh power bank? A typical 3.7 V model is about 74 Wh, under 100 Wh. Check the Wh rating on the product.
- Can I check a power bank in my suitcase? No. It must be carried on board.
- Can two share one zip bag? No, use one zip bag or pouch per battery.
- Can I charge my phone on the plane? Not with a power bank; seat ports may be available depending on the aircraft.
- Can kids bring two power banks too? Per-passenger limits may apply, but check each airline’s rules and let parents manage them.
Rules and details in this guide are as of August 2026. Check the latest official information before you travel.
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Schedules and prices can change, so check the Incheon International Airport before you go.