I'm still using batteries I received with my V4L starter's kit @ the beginning of October. Don't count re-charges, but I'm a chain vaper and haven't noticed any signs of degrading yet. I hardly ever let my batteries fully discharge, just rotate them through the PCC every couple of hrs. I recently added an X-long batt to my gear for convenience not having to carry PCC on me when I go out to the club, and that baby lasts me all night and then some.
Yeah, I have so many being used at the same time, rarely does one ever get to the totally dead stage. Every now and than I just grab different ones, exchange the carts and charge the ones I was using (I had 4 chargers from kits at one point - down to 2 now because of loans). I have one silver battery from April that's still working! It doesn't last as long as it used to, but it still vapes just fine. There just have been some posts lately of batteries going dead and people wondering if they should request replacements or not, so I thought I'd throw the question out there.