Can I bring a 20,000mAh power bank on a China flight?
- Last reviewed
- Ruleset
- 2026-05-15
- Reviewed by
- CertiWatt source integrity workflow
Short answer: A 20,000mAh power bank is often below 100 Wh, but that does not automatically clear a mainland China domestic flight. Check the printed voltage / Wh, readable 3C / CCC mark, exact model and recall status, carry-on-only handling, quantity, and airline policy before packing.
Many travelers search by capacity first because 20,000mAh sounds like an ordinary portable charger. At a typical 3.7V cell voltage, 20,000mAh is about 74 Wh, but airport screening does not stop at that math.
For mainland China domestic flights, CAAC screening can refuse power banks without a 3C mark, with an unclear 3C mark, or in a recalled model or batch. That means a 20,000mAh unit can still fail if the China-specific evidence is missing or unreadable.
Treat 20,000mAh as only one input. The useful answer combines mAh, voltage, Wh, visible certification mark, exact model, recall status, route, airline, number of power banks, and whether the device stays in cabin baggage.
Rule summary
- Capacity math
- 20,000mAh at 3.7V is about 74 Wh, usually below 100 Wh.
- China overlay
- Readable 3C / CCC evidence can still be required for mainland China domestic flights.
- Recall overlay
- A recalled model or batch can be refused regardless of capacity.
- Packing
- Power banks should stay in carry-on baggage and remain within quantity / airline limits.
Check your device
The final answer can change by model, airline, country, certification mark, label evidence, and recall status.
Check a 20,000mAh China flightFAQ
Is a 20,000mAh power bank under 100 Wh?
Usually yes if the cell voltage is 3.7V: 20,000mAh x 3.7V / 1000 is about 74 Wh. Still check the printed label because some devices use different voltage statements.
Can a 20,000mAh power bank without 3C be refused in China?
Yes. For mainland China domestic flights, missing or unclear 3C / CCC evidence is a separate screening issue from the Wh calculation.
What should I check on a 20,000mAh power bank before a China flight?
Check readable 3C / CCC evidence, Wh or voltage label, exact model, recall status, carry-on packing, quantity, route, and airline policy.
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. Open the full source registry.
Informational only. Final decision rests with airline and security staff. Why we said this.