I believe this is only for eGo-T batteries specifically because it blew me away that they have a cut off. None of my other eGo batteries have this feature as far as I know and vaping for 15 seconds would blow the top of my head off, lol. I would take one for the team and vape it for science though
I removed my atty and held the button to see if this cut off was perhaps the device getting low on power under load, still roughly 10 seconds in the button flashes and turns off. My guess is that this is a secondary safety feature just in case you do forget to turn your eGo-T off.
Interesting... ALL of my eGo batts have a cut-off of approx. 10 seconds. (I have 650s and the eGo-T 1000.)