Under Thailand’s current aviation rule, each passenger may carry no more than two power banks.
They must be on the person or in cabin baggage, never checked; units above 100Wh and up to 160Wh need airline approval, and charging or using them onboard is prohibited.
Find the Wh marking
CAAT requires a clear and correct watt-hour rating. If only mAh and nominal voltage are shown, the FAQ uses Wh = mAh x voltage / 1000. Photograph the label before travel in case the print is small. (CAAT dangerous-items list)
The current rule caps each passenger at two power banks. A multi-port unit is still one battery, while three small units remain three. Do not distribute a commercial quantity across family bags to evade the rule.
| Situation | What changes |
|---|---|
| Power bank is 100Wh or less | Cabin carry is permitted within the two-unit limit |
| Above 100Wh and not above 160Wh | Get airline approval before travel |
| Above 160Wh | Do not bring it as passenger baggage |
| Bag is taken at the gate for checking | Remove power banks before handing it over |
Keep them out of checked baggage
Power banks must remain on the person or in cabin baggage. If cabin baggage is gate-checked, remove them first. Pack them where they can be reached without opening a tightly packed suitcase at the gate. (Thailand Public Relations Department power-bank notice)
Use the original packaging, cover exposed terminals or place each unit in a separate protective pouch. Do not carry a swollen, damaged or recalled battery.
Example: A 20,000mAh power bank at 3.7V is about 74Wh: 20,000 x 3.7 / 1,000. It fits below 100Wh, but it still counts toward the two-unit limit and must remain in the cabin unused.
Do not use them onboard
CAAT prohibits charging the power bank from an aircraft power source and prohibits using it to recharge a device during flight. It also advises keeping units accessible rather than in overhead bins. Switch the unit off and keep it in the seat pocket or on your person as instructed.
The regulator sets the baseline, but airlines can impose operational conditions and must approve the 101Wh to 160Wh band. Obtain written approval before check-in and keep it with the booking.
