I have only had my vapor4life pen-style batteries for a little over a month and they are already dying

I don't know what to expect. I did suck on them like a crack pipe for a couple of weeks, but then I only vaped a couple of times a day for 3 weeks. I know they have a limited life, but I expected at least 2 solid months of vaping from them. Plus, the passthrough unit that came with the same start-up kit is seemingly malfunctioning at this point - it is making an audible pulsing sound through the carto and the carto is running really hot, like too hot to touch. I have tried the passthrough with 5 different cartos; it's the same with all of them.
So, I put an order in for another start-up kit with HHV. I'm getting 2 eGo 900 mAh regular batteries (manual) with USB charger and wall unit. I didn't get the VV because I've ordered $80 in juices today! I also bought a lot of different tanks, cartos, and some bottles with the needle top for easier filling. I'll review the juices when they come in.
Happy vapping!