Female battery (recessed
threads) and male
threads on the cartomizer as their picture shows?
ECIG ACCESSORIES, ECIG CIGARETTE CASE, ECIG CAR CHARGER, ECIG WALL CHARGER,
Try RN4081 cartomizers (Njoy Npro, Njoy 2-n-1 at some 7-11's, AZSmokeFree.com has some random RN4081 cartos). See if they work.
If they don't work then try a 99 cent 510 to RN4081 adapter from Goodprophets and if that works to use the RN4081 cartomizers then you have 510 threading. 510 threading has few prefilled cartomizers - for 510 threading you would use standard resistance Boge blank cartomizers you fill yourself (the ones around 3 ohms, not the 2 ohm ones which are not for slim batteries). And other 2.5 to 3 ohm cartomizers or atomizer + cartridges.
If it's female battery and neither works then you are probably out of luck.