MJTP:Ok. The heads have the end that goes into the battery, and the end that goes into the protank. Obviously we're not talking about the long tube end, that doesn't serve a purpose.
Correct. We're not talking about that part.
The other end of the head, where the resistence coils start, is what I'm talking about. On that end, there's a rubber gromet that pinches one end of the coil under its flap, and in the center of this white gromet is the other end of this coil, as the two ends of the coil are supposed to be seperated. Should this end be pulled out from the center hole where it touches the battery first, or should it be pushed down in there?
If the problem is that it isn't firing, then yes, that is one thing that can be the reason - that that end isn't coming in contact with the battery's center post. Easy does it on pulling it out - a few mm's should do it. The other thing could be that the battery center post needs to be 'pulled up' - usually done with the edge of a flat head screwdriver - again - easy does it because their are wires inside the battery connected to the center post.
All that said, the batts should be returned to the vendor as stated before by others. I don't know where that is between you and the vendor... but just for your info those center posts can be the problem. Or it could be something else entirely - just that is the most common when a battery is good but isn't firing the atomizer/coil.