On flights to, from and within Thailand you may take at most two power banks, only in your hand luggage, and you may not use or charge them during the flight (as of October 2026). Up to 100 Wh is allowed, 101–160 Wh needs the airline's approval, and anything above 160 Wh, or without a readable capacity label, stays on the ground.
A power bank is a spare lithium battery, and lithium batteries can overheat and catch fire. After several cabin fires, including one on a Bangkok Airways flight from Samui to Hong Kong in July 2025 that diverted to Bangkok, the international aviation body ICAO tightened the rules from 27 March 2026. Thailand's Civil Aviation Authority (CAAT) adopted them in June 2026, according to press reports at the time, and Thai Airways says it has applied them since 27 March.
This page covers power banks and spare batteries only. Cabin bag sizes, checked-bag allowances and which airline flies where are in our guide to domestic flights in Thailand.
Power bank rules on Thai flights, October 2026
- How many
- Two per passenger
- Where
- Hand luggage only; never in checked bags
- Up to 100 Wh
- Allowed
- 101–160 Wh
- Only with the airline's approval before you fly
- Over 160 Wh
- Not allowed on the aircraft
- Label
- Capacity must be clearly printed on the unit
- On board
- No use and no charging; keep it at your seat, not in the overhead bin
Two per passenger, and the old "20 units" figure
The limit is two power banks per person. If you search online you will still find an Airports of Thailand (AOT) article from 2025 saying CAAT allows up to 20 power banks of 100 Wh or less. That article is still live on the Suvarnabhumi website, but it was written before the 2026 change. ICAO's statement of 27 March 2026 limits power banks to two per passenger, and the Thai rules that followed use the same number.
The two-unit limit is per person, not per bag, so a family cannot pool everything into one backpack. Each traveler carries their own two.
Watt-hours: reading the label on your power bank
The limits are set in watt-hours (Wh), not in milliamp-hours (mAh), which is the number most power banks print in large type. Thai authorities give a rough conversion: 100 Wh is about 20,000 mAh, and 160 Wh about 32,000 mAh. That conversion is on the safe side. The real Wh figure depends on the battery's cell voltage, usually 3.6 or 3.7 volts, so the sum is mAh multiplied by the voltage and divided by 1,000. A 20,000 mAh power bank at 3.7 V is about 74 Wh.
| Capacity on the label | Typical device | Rule on Thai flights |
|---|---|---|
| Up to 100 Wh | Phone-sized and most laptop power banks | Allowed in hand luggage, max two |
| 101–160 Wh | Large laptop banks, some camera batteries | Airline approval needed before the flight |
| Over 160 Wh | Portable power stations | Not allowed |
| No readable capacity | Worn or unbranded units | Not allowed |
The label is the part people forget. A power bank whose capacity has rubbed off, or a cheap unit that never printed it, will not be accepted, however small it looks. If you are buying one in Thailand before a flight, check the label before you pay.
Why it has to go in your hand luggage
A fire in the cabin can be seen and dealt with by the crew; a fire in the hold cannot. That is why international rules keep spare lithium batteries and power banks out of checked baggage. AOT's guidelines for Suvarnabhumi say they are "strictly prohibited" in checked bags and must be carried in the cabin. The same applies whether you fly from Suvarnabhumi or Don Mueang (our comparison of Bangkok's two airports explains which airlines use which) or from a regional airport such as Phuket or Chiang Mai; the overview of Thailand's airports lists them all.
Thailand also has a new checked-bag rule from Friday 16 October 2026: screening staff may open your suitcase without you being there if they suspect a prohibited item, and seized items are not returned. A power bank left in a suitcase is exactly the kind of item that triggers this. Our guide to airport security in Thailand explains the inspection rule, locks and the liquids limit.
Check the side pocket of your suitcase before check-in. A forgotten power bank in a suitcase pocket is the classic mistake. Move every power bank and spare battery into the bag that stays with you, including any bag the airline may take from you at the gate when the cabin is full.
On board: no use and no charging
Since 27 March 2026 you may not charge your phone or tablet from a power bank during the flight, and you may not charge the power bank itself from the seat's USB port or power socket. AOT's 2025 overview already said that Thai Airways and AirAsia banned using power banks at any time during the flight.
Keep the power bank where you can reach it: in the seat pocket, under the seat in front of you or on your person. The Thai rules say it should not go in the overhead bin, where smoke from an overheating battery would go unnoticed. If a power bank becomes hot, swells or smells of burning, tell the cabin crew at once.
Charge your phone before boarding, not in the air. Top up your phone and the power bank at your hotel or before you leave for the airport. On a one-hour hop to Chiang Mai or Phuket you will not miss it, and on a long-haul flight the seat socket can charge your phone directly.
Connecting flights in China, Japan, Korea and Singapore
Readers flying on to China, Japan, South Korea or Taiwan should check the rules at the other end too. AOT's 2025 overview noted that domestic flights in China only accept power banks with the CCC (China Compulsory Certification) mark, that Japanese airlines want power banks visible at the seat, and that Korean and Taiwanese carriers ban using them in flight. It also said Singapore Airlines does not allow power banks to be charged from the in-seat USB ports.
Those notes date from before ICAO's 2026 change, and the two-per-passenger limit now applies more widely, so read your airline's own page before you pack. Flying in from the region is covered in our guide to flights to Thailand from Singapore, Malaysia, China and Hong Kong.
Cameras, laptops, e-cigarettes and other batteries
Batteries fitted inside a laptop, phone or camera are treated differently from a spare power bank, and spare batteries for cameras and drones have their own rules. Those are set out by each airline, so check the dangerous-goods page of the airline you are flying with. Two things are simple. A portable power station rated above 160 Wh stays at home, whatever it is called. And vapes and e-cigarettes are banned in Thailand altogether, which our guide to Thai customs rules explains; if you only change planes in Bangkok, read our page on transiting with a vape.
Packing a power bank for a trip to Thailand
- Pack no more than two, and check that each one shows its capacity in Wh or mAh.
- Put them in a pouch or case so the terminals cannot touch keys or coins, as AOT recommends.
- Keep them in the bag you carry on, and take them out of any bag that may be checked at the gate.
- For anything between 101 and 160 Wh, get the airline's approval in writing before the trip.
Our packing list generator and the older guide on how to pack for Thailand cover the rest of the bag, and the article on power adapters for Thailand explains the sockets you will find when you land.
Frequently asked questions
How many power banks can I take on a flight in Thailand?
Two per passenger, in hand luggage only. ICAO set the two-unit limit from 27 March 2026 and Thailand's CAAT adopted it in June 2026. AOT's older page mentioning 20 power banks was written in 2025 and is out of date.
Can I bring a 20,000 mAh power bank on a Thai flight?
Yes. A 20,000 mAh power bank is below 100 Wh, which is allowed without airline approval. It must be in your hand luggage and have its capacity printed on it, and you may not use it to charge anything during the flight.
Can I use my power bank on Thai Airways or AirAsia?
No. You may carry it, but you may not charge your phone from it or charge the power bank itself during the flight. Thai Airways confirmed the ban in April 2026, and AOT says AirAsia also prohibits using power banks in flight.
What happens if I pack a power bank in my checked bag?
From 16 October 2026, screening staff at Thai airports may open your checked bag without you to remove prohibited items, and AOT says seized items are not returned. Non-TSA locks may be cut, with no compensation.
Sources
- Bangkok Post – Thai Airways stresses 2-powerbank limit per passenger (3 April 2026) (checked October 2026)
- ScandAsia – Thailand introduces stricter rules for power banks on flights (4 June 2026) (checked October 2026)
- Airports of Thailand – Guidelines for Checked Baggage Inspection (Suvarnabhumi) (checked October 2026)
- Airports of Thailand – Updated rules for carrying power banks on airplanes in 2025 (checked October 2026)