Coz gate security is adamant about no lead weights in carry-on. Plenty of warning signs in English.
We used to see dive lights confiscated for having batteries in them, back when all dive lights got very hot if accidentally turned on. Maybe they expect dive lights to be LED now?
Nail clippers are legal nowadays and can be used to cut most cable ties.
A few years ago I was required to remove all the batteries from my dive lights in my checked luggage. Since then I have done that as a matter of course; if for no other reason it saves weight.