I take the batteries off my SRAM etap derailleurs. Actually take the RD off the hanger, too. Battery lights, Varia, 1030, and power bank all come on the plane with me. The 18650 or 21700 batteries from the light go into a small case. I do not take CR2032 or similar small coin shaped batteries out of various bits and pieces on the bike. I put the chargers and batteries in one clear plastic bag. It goes into my personal bag and I do not take them out. TSA has never inspected them. TSA is more concerned if you smuggle water onboard.