[etempleton]

Is the issue that many power banks have cheaply made batteries compared to phones, tablets, and laptops? Why power banks specifically?

If the issue is quality control is there certification that airlines might require?

[trollbridge]

Because the quality control on power banks is absolute rubbish. They're typically bought from no-name vendors on Amazon with zero accountability for if they go bad.

Overall, the U.S. and other countries need to start requiring UL listing for stuff like this before it can be imported into the country (and strict liability for any domestic manufacturers).