Reading about cartomizers now.. Didn't understand it before, but now that I've played around with my kits, I think I understand.
It could also be the juice you are using that causes you to not notice much difference?
Most people that moved from a 3.2 volt 510 to a 3.7 volt mod notice a very big difference.
But I haven't seen many people talk about any differences between 3.2 volt Egos and 3.7 volt Rivas.
I just assumed it was because very few people had both.
I know that once I took a drag off a true 3.7 volt mod I put my 3.2 volt 510 in a drawer.
There is no way I could ever go back to that again, the difference is so noticeable.
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I don't really know.BTW, is the voltage the same on the 1000 mah batteries as the 650?