Airline specifications for Lithium-ion batteries are found in the link below and clearly specify that lithium-ion batteries installed in electronic devices can travel in carry on or checked baggage: Here is an excerpt from the regulation FAQs: "Question 2. The batteries we use in our products are below 90 watts and most importantly are "installed" in the device which permits them to travel in carry on or checked baggage. The "spare" lithium-ion batteries also have restrictions for travel in carry on with limits to 2 x spare batteries of 100+ watts. Most airlines have restrictions for "spare" Lithium-ion batteries and these can't travel in checked baggage.
To travel safely just ensure that the master on/off button is in the "off" position. The Light & Motion continuous lights with integrated lithium-ion batteries can be safely transported in carry on and checked luggage because the batteries are safely installed/integrated in the light (unlike spare lithium-ion batteries). How do you travel by air with the CL lights?
Integrated Li-ion battery: Run completely cord free for 45 to 415 minutes and because the battery is integrated into the device (permissible in both checked and carry-on luggage).
the L&M website is sparse at best (go to the "Manual" for the light and you get a picture of the light. The "Manual is one page the size of a post-it notes (not much help to decipher the esoteric set of "Close Encounters of the Third Kind" flashing LEDs it uses for status indicators).