If you are traveling with your IR camera or other battery-operated equipment to, from or within the USA - and perhaps elsewhere around the world - the U.S. Department of Transportation's (DOT) recent pronouncements about the rules governing the transport of batteries containing Lithium* means you may have to plan a bit more carefully how many rechargeable battery packs you carry with you, and how you carry them.
This rule, which took effect on January 1, 2008, prohibits carriage of spare lithium batteries in checked baggage (suitcases that you hand over to the airline for handling). Portable electronic device with batteries installed can still be checked in.
Spare batteries can be carried in the hand baggage.
*Older cameras that use NIMH (nickel-metal hydride) or NiCad (Nickel Cadmium) batteries are not covered by this rule.