If it's for a kit, also a mechanical lockout. Though believe most aluminium bodied lights have it, just by unscrewing battery cap a half-twist to break the connection.
Where this works, it's great. Where it doesn't, I use a label printer to create a "REMOVE BEFORE USE" tag that I put between the base of the battery and the battery cap, leaving enough of the tag out of the screw threads to be very noticeable. I haven't had any issues doing that so far, but I'd definitely suggest that one make sure to test that the label doesn't do something Bad to the threads.
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