I noticed the problem while repacking my carry-on before a China domestic flight. The old power bank still worked, but the label was worn enough that I could not quickly explain what it was.
That changed my rule. I do not only ask whether a power bank can charge my phone. I ask whether airport security can read and judge it quickly.
Capacity is not the whole question
Capacity and rated energy still matter, but they are not enough. Clear markings, CCC information, brand and model details, and an undamaged label make the device easier to inspect.
A power bank that you understand but security cannot quickly verify is a bad travel item.
Pack for the security line
Power banks and spare lithium batteries belong in carry-on luggage, not checked baggage. Place the power bank, laptop, tablet, camera batteries and cables in easy-to-reach layers.
The point is not to look organized. The point is to avoid opening half your bag while the security line moves behind you.
Fewer clear devices beat more uncertain backups
Bringing several unclear old power banks does not create real safety. It creates more inspection points. Bring one clear, small, compliant device and save battery before boarding.
Saveable summary
| Question | Safer move |
|---|---|
| Checked bag? | Carry-on only |
| Capacity only? | Check CCC and markings too |
| Old worn label? | Do not gamble at security |
| Packing position | Easy to take out quickly |
