Damselfish
Contributor
well, the official TSA stuff currently suggests it's preferred to put batteries in carryon, though you can put them in checked. Aside from the whole lithium issue of course. (Yeah I know, what they say at the airport about anything is related to the phase of the moon.) Anyway, I've never had an issue. And we carry quite a few for strobes too. What we actually tend to do is distribute them around.