Sorry to hear that you have been "ripped off". Be more carreful in the future...
Cartomizers don't really last as long as a pack of cigs, especially prefilled ones which may be light on juice to prevent leaks, especially if the unit has auto batteries and the vendor doesn't want to kill them with juice leaks. Ripoff rebranders like to say a carto lasts as long as a pack of cigs or even 1.5 packs. It's just a lie.
However, if you keep a carto damp by adding juice when it needs it, and not let it run dry (which could singe the stuffing or strain the atty inside), then a carto can work well for days or longer.
IMO
If you want to keep using prefilled cartomizers including any you have left over - get manual KR808D-1 batteries, in the standard length. I recommend manual ones even if you think a button would bother you. Manual batteries are not dependent on a threaded end drag sensor so harder to kill with a juice leak. Manuals won't turn on by accident from wind or vibration. And I think they are less work. The button makes it make vapor and you can drag softly or however you want.
You can get plain white and steel KR808D-1 at LiteCigUSA.net or VaporLeaf.com, and colors plus prefilled cartos at Vapor4Life.com. Bloogplanet also has prefilled cartos. To be safe you could just order one battery first and see if it works with your charger and cartos.
If you want longer battery life for the same kind of cartos - there is KR808D-1 XL for 380mah which may give 4-6 hours (but they will not fit in the PCC) or the fat battery models Le Cig's PigCig or Cigeasy's Elegant Easy (both should give 6-8+ hours, and need their own PCCs if they offer those)
If you want to switch to something totally new and use atty+carts (need filling more often) or use just blank cartomizers, look at Joye 510 (standard battery charge life would be like a short KR8 or maybe your cirrus II, mega xl 510 batteries have charge length like a standard KR8), and Ego or Riva 510 for fat battery models.
Yeah while we're at it I fully endorse:
MadVapes
CloudsOfVapor
ValueVapor.com
LiteCigUSA.net
IkenVape.com (attys&Cartos)
GourmetVapor
Blu (even though they're a little overpriced, they have gotten a lot of people to convert)
Volcano
And soon I will probably be endorsing:
FreedomSmokeUSA
TastyVapor
Great Lakes Vapor
and TheEcig.com
There are a lot of reliable, fantastic Vendors out there. People like this white cloud vapor make the whole industry look bad, and they got a very polite passive-aggressive email from me a half hour ago.
send the junk back with registered mail so you have proof that you returned it and file a protest with your credit card company..
I would add to the list of trusted vendors:
Gotvapes
Nhaler
LIberty Flights (20% off coupon at top left)