http://www.e-cigarette-forum.com/forum/ikenvape/96761-cartomizers.html
Here is another good thread for you to read on cartomizers!
I have used the Kr808d-1 from Vapor4Life, the Joye510 basic kit, The precise by SuperTManufacturing, the JuiceBox by Carlos, 901 basic setup, a boxmod or two, my 2 go to pv's are the Chameleon by ikenvape(allows the use of 901/801/510 atties and cartomizers) and a joye ego. I use cartomizers when necessary, but prefer to drip on a 510 atomizer.
All in all it boils down to:
Atomizer/Cartomizer preference and Battery power.
There are a few extremely knowledgeable members here that have proven the different Ohms that the atties and cartos are being made with and the life span of them and how they work with different pv's and the battery powering them. It is a lot to take in and takes many hours of reading.
Keep what you have or send it back immediately and do more reading about all the different set-ups. I say to keep your first purchase and find out what you do and do not like about it and gather info in the mean time. You may find out that you can purchase adapters that may allow you to use your existing battery with an atomizer.
madvapes and goodprophets sell adapters, you could e-mail them about the pv you have and see if they have an adapter that might work on your battery so you could try a 901 atomizer, 801 atomizer or a 510 atomizer/cartomizer.
I wish it were more simple.