Malkoff E2XTD on their 18650 e-series body. I thought this would be too narrow of a beam profile, but I actually find it very useful for anything that I can't use my key chain light to illuminate. It seems to get adequate runtime with the 18650. I need to check with Malkoff to see if it will work with a high drain unprotected 18650. Some direct drive lights are designed around the internal resistance of a protected cell (like the recommended Keeppowers). It would be interesting if it can get even slightly more performance off of a high drain cell.
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