When in China, I always carry a bag for all items that will cause a re-scan:
* Adapters, wires
* Keys, coins, my thick watch, my phones (they don't like anything blocking the view
* LAG, of course
* Power banks, of course too - they must be properly labeled. They sometimes have instructions posted and sometimes verbally communicated to remove power banks for inspection.
* Cameras (if any, but I don't use cameras these days).