Hi dknauf, I think I am one of the few on here who uses cartridges, at least that is willing to admit it

It sounds like you got a bad, dry, batch as someone suggested, I would try filling one of them with a coordinating flavor of juice, you can use the "condom method" check it out on YT if you are not famiiar with how. If they are dry, this may add enough moisture for you to get a use or two out of them. I use both prefilleds from Eversomke, Vaporzone and South Beach and V2 blanks. To make my prefilleds last longer, I keep the same flavor juice around (you cannot dismantle any of those cartrdges I just mentioned, except the V2s to wash them, to my knowledge) and just refill them using the condom method when the vapor or taste starts to change. They last maybe 1-2 refills and then they will start to taste burnt, period, then you know they are finished. I use the V2 blanks for other flavors that are more "exotic".
I also see the beauty in prefilleds, I play with my juices and fill my cartridges at home, but when I am out working, it is nice to just be able to grab some prefilleds and go. I drive all day and do not want to mess around with juice in my car, that is just me, and again, when I get home I will fill some of those empty prefilled with more juice and get a little more money's worth out of them. It sucks to get a bad batch, they aren't cheap, but see if adding some juice corrects the problem.