I had a battery stick a few times, blue LED stayed on for about 30 seconds. The tank was dry, but because it had dumped juice through a worn seal and flooded the battery contacts, shorting them out ...
The downside of reusing atomizers over a long period is that they seem to physically wear out, the press fit of the spike end gets weaker, and the o-ring at the bottom flattens out. Combine that with a sloppy tank seal, and you have a juice dump onto the battery ...
Now I'm trying to use only tanks with the seal replaced with the soft silicone insert, it hugs the spike better ...
As with all things mechanical, small variations in size can stack up with certain combinations of components, and create a leak path ...
But I still love my eRoll, best stealth vape I've found ...