I fly frequently on American Airlines-( I'm Executive Platinum status). Always take Mavic Air with battery attached, and 3 more batteries in lipo bags (Amazon) as part of my camera case. Never even heard of a problem at TSA. Never checked battery level before hand. Just pack them as they were. Recently flew to Iceland on Delta - same non-result or problem at check-in in Miami to JFK, and onward to Reykjavik. No problem from Reykjavik to JFK check in either. hey just put the camera bag through the scanner.