If there is a battery in the checked baggage. Dangerous goods, when checked with X-ray, will be unpacked for inspection if they fail, so the counter girl will ask you to wait after you have finished your boarding pass, and if your luggage fails, you will be asked to open the inspection or take out the unqualified things

? I don't think it's necessary. You need to fasten the suitcase with a luggage belt to prevent the zipper of the luggage from being broken during transportation.

You need to carry the battery and charger with you, and the liquid should not exceed 5ML, which is more than you need to check. Alcohol should not exceed one kilogram. As for things you can't take with you, I suggest you check on the airline website faster. Generally speaking, meat, fruits and knives and machinery are forbidden.

When handling the boarding pass, you can ask the young lady to take a sticker like "Handle with Care" and stick it on it.