what kind of issues/what size lights/batteries, looking at a trip to Cozumel and I have big blue 30,000 lights so more info would be helpful Thanks Tod
If they think that the battery cannot be separated from the light head they may try to confiscate it. Sola lights look a bit like that. My apologies if you already know this, but you can unscrew the front and remove the light head.... and there is a flight position you can replace the head in which means that the light simply cannot be turned on, even if you operate the switch. I would advise you to do this, and be ready to demonstrate it if they ask.
Further to Chris's post, know the capacity of the battery (that means having documentation that shows it), and have a copy of the regs that show a battery of that output is allowed. I can't remember the numbers, sorry, but Sola lights are fine. Trouble is, there are some TSA and overseas security people who don't know their own rules and some strange (and costly) things have happened to underwater photographers. I had a close call with my Big Blue lights in Mexico recently.
Simon M[/QUOTE]