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Yeah I think he said another week or so before those go live I believe. BTW, still using the Nitecore DI you sold me (and delivered) a few years ago, thanks!It may have something to do with the length of the battery. RCR's are a bit longer than cr123, I believe. Because the E1's don't typical have a head-end spring there is a potential for crushing the battery.
Given that new LF bodies are designed to accept larger batteries (18350), it should work with RCR's.