The istick is pretty small for a box, but I get it.
For the Vamo, I had a V5 and the battery tube was press fit to the portion that housed the electronics.
It was a bad design and the press fit popped out a few times on me.
It wasn't really a big deal since you can just smack it on the desk to get it jammed back in there.
I watched a review on the V8 and it looks like that piece is threaded now, so it should be a solid performer now.
Regardless of what you settle on, keep a back up for emergencies, cause the stinky temptation is at every corner...