I have now tried the vapor king ash cap and diamond series batteries as well as the WOW cartomizers. 2 of the batteries were duds and the ones that worked were just way to airy. Also the carts (blank) gave off a burnt flavor. I used my favorite halo juices and they taste way worse the. when I tried the LR cartos from boge and Halo. Im sending everything back for a refund but because they were 2 seperate orders I am out 50 dollars in shipping (I live in Canada). Just the feel and the vape of the units imho couldnt hold a candle to the other kr808s I have tried. If you are going to spend 50 bucks or 75 bucks on a kit I think you have some better options out there. Halo is still my favorite as well as the Redds starter kit. V4L does try hard to give good customer service but imo Halos service is better and the quality is 5 times better. I know there is a lot of V4L lovers out there because if the longer cut off times but have you tried other brands? I find Halo/Volt/Redds to be far superior. Just my 2 cents. Expensive lesson for me.