The more I read this thread this morning, the more I became intrigued. I love my Twists, Mini's and mods. I do like a what the eRoll offers however it is automatic and I usually do not have any luck with those. I fried my first SD keyring because liquid got in the battery. Ordered another and was afraid to use it very often so I put it away.
Anyone have problems with juice getting into the battery?
I overfilled a tank and had a substantial amount of leaking. Totally my fault, not at all a flaw with the system. That being said, I definitely got juice in the battery connection. It still works perfectly. That may not be the case overall, but I wouldn't worry about it. These auto batteries seem a lot better than the old style. And they are only $8 if one did get ruined.