I have both versions in my possession. There is very little difference between the two other than the indicators that were posted before:
The V2 has reworked battery caps, where one groove is significantly wider than the other (I think depth of the cut is only a factor of the quality of the rework).
The V2 (that I have at least), has a thinner LED light band than my V1.
Some people can see sealant at the bottom of the atty chamber (I can't, but still believe I have a V2 as there is no visible light when the button is pressed).
Some people think the button is 'clickier' or something, I don't see/feel that difference between the two.
At the end of the day, if Janty said they sold you a V2, they probably did.