Keep power banks with you in the cabin, and do not confuse permission to carry one with permission to use it in flight. Before leaving home, read its Wh rating, count your units and check the operating airline’s policy. Prepare your phone for arrival without relying on power-bank charging aboard the aircraft.
Battery rules are separate from cabin-bag weight. Buying extra baggage does not make an otherwise unsuitable battery acceptable. A bag within the weight allowance still needs its contents checked.
Start with the label
The CAAT dangerous-goods list specifies a maximum of 2 power banks per person, a clear Wh rating and carriage on the person or in cabin baggage only. Above 100 Wh and up to 160 Wh requires operator approval. Charging the bank or using it to charge devices while aboard is prohibited.
| What you find | Action before flying | Do not assume |
|---|---|---|
| Legible rating at or below 100 Wh | Check quantity and airline policy | Bag weight is the only other condition |
| Above 100 Wh, up to 160 Wh | Obtain airline approval before packing | Staff will always approve it at the gate |
| Above 160 Wh | Do not rely on this passenger power-bank allowance | Extra checked baggage solves the problem |
| Missing or unreadable label | Check manufacturer information and ask the airline | An online product picture will replace the label |
| Several banks at home | Choose only what you need and check per person | A group’s allowance can all sit in one person’s bag |
This table helps you inspect what you own; it does not approve a brand or model. When approval is needed, send the model, a label photograph and every flight. Save the reply with travel documents and recheck if the airline changes.
Understanding mAh and Wh
Wh expresses energy. A mAh number alone cannot provide the comparison without voltage. Use Wh = mAh × V ÷ 1,000. In a hypothetical example, a 20,000 mAh battery rated at 3.7 V equals 74 Wh. This explains the calculation; it does not certify every power bank advertised as 20,000 mAh.
Read the manufacturer’s printed energy rating first. Where several voltages appear, do not guess by substituting a USB output voltage for the battery voltage. Photograph the label for enquiries, but do not remove, cover or rewrite it as if you were the manufacturer.
Airlines can be stricter
Bangkok Airways’ announcement, effective 1 June 2026, prohibits onboard use or charging and allows at most two power banks of 100 Wh or less per passenger. CAAT’s approval category for larger units therefore does not grant automatic acceptance on Bangkok Airways.
For connections, inspect every operating carrier, not just the company selling the ticket. Acceptance on one flight does not settle the next flight’s rules. The Bangkok Airways guide provides booking context; recheck the airline’s announcement before travel.
Make removal easy if your cabin bag is checked
The Thai government’s explanation confirms individual short-circuit protection and prohibits storing power banks in overhead compartments aboard the aircraft. Keep them accessible according to crew instructions. Use separate protective pouches that you can locate and remove, instead of burying them under clothes in a wheeled bag.
If staff take your cabin bag for hold carriage at the gate, tell them it contains a power bank and remove it before handover. Do not rely on that bag having stayed with you on past flights. A change in how a bag travels requires another look at its contents.
Plan phone use before boarding. Charge it beforehand and save your boarding pass and destination address offline. When travelling in a group, let another person keep a copy of the route and pickup details without sharing account passwords or payment information.
Before leaving home
- Read the Wh rating and count units per person.
- Check every operating airline, including the return journey.
- Obtain advance confirmation for a size requiring approval.
- Protect each unit separately and be ready to remove it from a bag sent to the hold.
- Save travel documents offline and charge your phone before flying.
- Check for belongings before leaving your seat after landing.
Use the Thai-language baggage comparison guide for bag allowances alongside these checks. Choose a route from the flight catalogue and record the operating airlines in your trip planner. If you need a replacement device, add the actual quoted cost to your trip budget; a higher price does not mean easier acceptance.
Frequently asked questions
Can power banks go in checked baggage?
No. Keep them on your person or in cabin baggage. If a bag is checked at the gate, remove the power bank before handing it over.
Can I charge my phone onboard with a power bank below 100 Wh?
No. Carriage and use are separate permissions. CAAT prohibits using a power bank to charge devices while aboard.
Does Bangkok Airways accept a 150 Wh power bank?
The reviewed announcement allows units up to 100 Wh, with a maximum of two per person. Do not bring a 150 Wh unit relying on CAAT’s general approval category.
Sources and review scope
Checked the CAAT dangerous-goods power-bank entry and Bangkok Airways announcement effective 1 June 2026. The arithmetic example is hypothetical, not a product approval. Every airline policy and individual screening decision were not verified.
Checked 26 October 2026 (Moscow), 25 October 2026 (UTC).