I'm not sure but I love using the 1.5 ohm atomizer's with the ego/riva
batteries. I was going to buy a ego if they ever get a
tank resistance down to at least 2.0 ohm. I have some of the the riva se 2.2 ohm atties and they barely do it for me. I know it kills the battery/switch faster but I don't mind it and just consider it part of the cost.