I’ve only run it with two 18650 cells. Never tried any other cell configuration. I’ve had it running continuously on full blast for about an hour, it performed well but I do not have the experience as many others here have, so I cant help much. I haven’t tested what current it pulls on the tail cap.
It did however have the dreaded next mode feature, but I solved that with the help of this thread, post #33 to be exact: Attention! Solution for most of those next mode memory drivers!
Post #72 I posted a photo of the driver, followed by comments on the solution.