Thailand 20,000 mAh power bank rule
- Last reviewed
- Ruleset
- 2026-05-15
- Reviewed by
- CertiWatt source integrity workflow
Short answer: For Thailand departure or transit, current CAAT guidance can apply a 20,000 mAh cap. That means a power bank above 20,000 mAh can be a problem even if its Wh rating is below 100 Wh.
Most global airline guidance is framed in watt-hours, but Thailand is a useful reminder that some jurisdictions use additional capacity limits.
A 20,000 mAh power bank at 3.7 V is about 74 Wh and is usually below the 100 Wh threshold. The Thailand overlay is different because it can look at the mAh figure directly.
If your device is labeled 20,000 mAh exactly, keep the label legible. If it is 20,001 mAh or higher, run a trip-specific check before you travel.
Rule summary
- Applies to
- Thailand departure or transit scenarios.
- mAh cap
- 20,000 mAh under current CAAT guidance.
- Why it matters
- mAh can matter even when Wh is below 100.
- Carry-on
- Power banks still must travel in cabin baggage.
Check your device
The final answer can change by model, airline, country, certification mark, label evidence, and recall status.
Check a Thailand flightFAQ
Is a 20,000 mAh power bank allowed in Thailand?
It may be allowed if it is at or below the cap and satisfies other conditions, but travelers should keep the label clear.
Is 20,000 mAh the same as 100 Wh?
No. At 3.7 V, 20,000 mAh is about 74 Wh. Thailand’s cap is a separate mAh-based overlay.
Does this rule apply to every country?
No. CertiWatt applies it to Thailand-relevant trips instead of treating it as a global rule.
Sources and evidence
This guide is reviewed against CertiWatt ruleset 2026-05-15. Active rule citations pass the source integrity release gate before deployment; trip-specific verdicts can still cite additional regulator, airline, manufacturer, or recall sources.
Informational only. Final decision rests with airline and security staff. Why we said this.