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@BringMeMyFix
If anyone's got a Blackburn Mars 4.0 that suffers from the common issue of eating batteries while it's off (if you look at reviews, there are clearly a lot of lemons leaving the factory), and if you can't be bothered / are unable to get a replacement via the lifetime warranty, I think I've sussed it.
I got mine out of the drawer during a recent clearout, ready to bin it, but took it apart instead. If you remove the 2 little screws that hold the LED section to the back/clip section, you'll see the heads of 3 little screws which attach the clip. I think on some of the units manufactured, the screws contact the metal bar which is part of the upper battery connections. It stands a little proud of its plastic housing on mine. I left it disassembled with the batteries in for a week, and no drain - usually it would be dead in 2 days. I've covered those 3 screw heads with 2 layers of electrical tape and reassembled. A week later - no drain.
Sorry for lack of pictures and lack of relevance to almost everyone.