China bans non-certified power banks on their domestic flights, even if they're not in use. And the certification authority is China-specific, they don't care about UL or any others.
I had this happen at the Shenzhen airport a few weeks ago. They confiscated my Apple MagSafe battery because it didn't have the CCC mark. From the looks of it, they were confiscating a lot of them.
It was a missed opportunity for someone to not have opened an approved power bank store just past security.
https://www.travelofchina.com/china-power-bank-ban-2025-xiao...