I dont know, but I have no issues with the ELA being able to stand up. Yes its tapered bottom button makes it a bit less stable , but in 18350 or 490, its not unstable. I can imaging that in 18650 or kicked it might be a bit unstable but really not much more than most 20 or 22mm mods.
I would never stand mine on it's end. I have little beds(trays) all around the house, to lay her in. But, I do have cats.