Are the lithium batteries in these lights safe, or are they prone to catch fire?
No fire concerns, no. (Obviously assuming you’re using them responsibly ).
Why would any company sell battery operated ANYTHING that is “prone to catch fire”?? ADJ (American DJ) is a very well respected mobile lighting manufacturer. They (along with Chauvet) are the primary lighting company of choice for mobile DJs worldwide. If they’re selling anything that’s “prone to catch fire”, they won’t be around much longer.
To be fair, these people seem to be doing so…
…so apparently somebody is.