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Guess it's just my bad luck then lol I've got 1 working still, and another that I built for a friend that is still working, but this one that I just happened to swap in a NiteCore gave up the ghost out of the blue. Seemed a big coincidence as it was running strong up until that point. After...

I have 4 of these: "NiteCore 2300mAH NL183 High Discharge Performance w/ Integrated battery overcharge/discharge protection circuits". I usually use them in a flashlight which uses a Cree XML-T6 and they tend to perform extremely well. I thought I would try one in the 405nm setup I put...

A single 18650 or other Li-ion battery would be perfect. I've recently purchased two of those same diode setups from DTR (and about to purchase a third diode but without the driver board and extras) and I power one with a single 18650 Panasonic battery I pulled from a laptop battery pack...