as they are only manual....the manual button lights up when pressed
ya know.. I didn't even know I wanted a VV battery (which I just mis typed as Vatery) but but.. if it makes the T3 vapor warm.. I'm in! ooooooo and since it's not a passthru.. does it have a snazzy LED on the end for when in use? I'm old but I still like lights and sparkly things.