This is supposedly possible by prying off the rubber carto mouth-end, and adding
juice. Ideally the
juice should be injected between the filler roll and the cart wall via syringe, and not so the center gets wet, and then let the juice soak in for a bit. But I personally was not successful in doing this, regardless of what one of the vids said. The added juice clogged up the carto and it never vaped the way it was supposed to. Perhaps there is more to it than this method, but I ended up getting a 510 because I was sure I was not going to be able to add my own juice to the GS cartos.
Someone familar with the kr808d-1, another carto PV, might have a better way to to this. I even tried this with the GS passthrough, which is very good with stock cartos, but the added juice got inside the PT through the carto and screwed it up. The same may happen with your batts, since they are auto and also have a center hole that juice can get into.
Good luck! If you find a way to do this successfully, let us know. I for one would like to not see my GS batts go to complete waste. These is likely a trick for this, but I didn't figure it out. Sorry.
