Two years ago we flew out of Coz (July 2016) on American. The American desk agent asked specifically about our camera batteries, looked at them, told us they go in our carry-on and our AA rechargeable batteries go into the checked baggage. I did have a small adjustable wrench and mosquito repellant wipes confiscated from my carryon. First time in 9 trips to Coz that I had any problem. Batteries were a non-issue thanks to the AA desk agent. As we are going to be flying out of Coz in August, I hope to do the same (but with small tool and mosquito repellant in checked bag).