Since you mention specifically South Korea, I just (2018/6/16) went through security at ICN, terminal 1. Here’s what happened:
So the answer is your power bank will be inspected in Korea, but by airport security rather than the airline.
In China, they are super strict about batteries and yes they read. I haven’t seen that much in the US, they seem to not be as strict.
No, they don’t. Security looks for weapons and bombs; if it’s not either, they’re not interested. Of course, there’s always the off chance that you’ll run into some particularly zealous and clued-in inspector with a fetish for lithium batteries, but realistically I wouldn’t worry about it.
Also, 90% of the regulation you link to is about transporting lithium batteries in bulk as cargo, which they are concerned about since there have been high-profile accidents link to lithium battery fires in the cargo hold.
Credit:stackoverflow.com‘
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