From Googling, it appears that Vapor4Life's batteries are KR808D-1. They are the only KR8's I have but I've never tried 'cross pollinating' brands before. I just didn't want to plug one of the new G6's into a V4L charger and have it go poof or anything.
Update: all my mom's new G6's came today and the good news is that they are totally compatible with all V4L.
I've been putting your juice in their carts since I discovered your juice, so I'm glad that I can use some of their carts and blanks on these new batteries. And so far, their charger seems to be doing the job. I have yours and one of theirs plugged in side by side... and no fires or explosions yet, LOL.
Update #2: After spending the better part of the day 'comparison cross pollinating' (v4l carts on the G6 and vice versa) I can definitely say that the Halo cartomizers outperform the V4L's. They are quieter (like they're a true perfect fit on the G6, inaudible 'air' noise upon inhale), they produce double the vapor, they remain much cooler and I think they taste better. Though the V4L's will work on the G6, you don't get the same performance. V4L's carts work best on their own batteries and I say the same for the G6. You can vape the V carts on the G6, but they tend to get hot and it makes for a less than optimum drag more often than not.