I am not familiar with different types of battery posts on eGo
batteries.
Since there are two different
threads on an ego (the standard 510 threads and the outer 'ego' threads) you have some attachments for both threads.
Most pieces use the standard 510 threads: cartos, attys, C4 clearomizers/stardust, vivi nova, etc.
Kanger's T2/T3 uses the outer 'ego' threads to make connection to the battery. These clearos cannot be used on some
mods w/o a 510/ego adapter to provide the outer threads.
Those are the only attachments I am familiar with that utilize the outer threads exclusively, but I'm sure there are more out there.
The pics I have found for Cyclone Maxx suggest these are C4-style "stardust" type clearomizers, which use the standard 510 connection.