Thanks for the information! At least I now know what kind of batteries they are. I think it's only lithium that can't be packed in checked baggage because of the fire danger. I also sent my questions to TSA and to Ikelite. I have read up on travel advisories etc. to Indonesia and understand that N. Sulawesi, Manado area are not currently experiencing any human violence. After our recent tidal wave scare here in Hawaii, and the horrible one in Indonesia a few years back, I think I worry more about that. Again, thanks!