Hehe, lots of mixed info and feedback.
Yes i agree, it wouldnt make sense for a new user to buy this + 2 batteries. The only "purpose" this thing would have, would be to say sell it at a cheap price ( and now this is just an IDEA; so dont tell me oh you said it only needs to cost this much =)
Lets say the device here, - which is _only_ the middlepart with the button, - no atomizer, and no battery, would cost say 15-20 euro. Then existing kissbox users, that doesnt have the JS or any other long duration vaping device, could use this with their existing batteries to produce a long lasting at home vaping device.
This was the idea, and i agree, going beyond this and extending the device with usb, charger, etc etc, then we might as well make a new jantystick ( which we are working on ).
So - the idea has to be viewed in the above perspective =)
Regarding the dual size atomizer chamber, - its not that easy. You cant only resize part of the chamber, you will also have to resize alot of the lenght and so on ; But alot of work is being put into thinking / inventing new atomizers for the future. So lets see what that brings!

Thanks for the comments so far