It’s not the “airport” that make the rules. It’s the airlines.
Having seen many posts on this over the last few years, you’ll find that the person you ask …
a) may be a jobsworth working for the airport, not the airline
b) may not really know
c) is not an airline representative - and it’s the airline’s rules that must be obeyed.
The best advice I’ve seen is to find the information on the airline’s website (EVERY airline has information regarding Lipo batteries), print it off in its entirety so that it includes all the page headings to prove it belongs to the airline you are flying on, obey their instructions, and take the printed page with you should checkin not be following that airline’s policy.
Also see …
And for an illuminating tale of what can happen when you are doing EVERYTHING right, and find yourself dealing with “airport officials” that don’t know/don’t want to know the rules … combined with a misplaced sense of power and importance, this is a worthwhile read …