I just received my Provari Standard with the extension cap cause all I had battery wise were 18650 but I kinda like the size in 18490 mode. I went ahead and ordered me a couple but was just wondering what the difference in battery life between the 2? When Im at home I will prob use in 18650 mode and 18490 when Im out and about. Fits perfect in my case that way and I will only have to take my Provari instead of my usual 2 Vision Spinners,