and it works great, I was testing this 510 out for a lady that gets little or no vape from it. Loaned her some 910 manual batts and a couple of attys that work great. She couldn't use them either. Her 510 works great with 510 carts or 901 carts. I think maybe it is a cerebral problem and not an equipment problem. She is in another town so I don't know how she is not using the PV's properly. 