Hey, everybody. Obviously I'm new to this forum, and also new to rebuild able atomizers. But I've been vaping for about 7 months now. Recently I purchased a used RBA mod from a friend. He let me test it out and all that .... before I bought it, showed me the duel coil RBA is running at about .5-0.6 ohms. I recently had to purchase my own batteries and not knowing that regular 18350's wouldn't actually fit in my vape, I purchased two mini batteries that are too small to use. I tried to actually use the batteries stacked on top of each other. It seemed to work fine, wasn't overpowering or anything. But my friend says that using two 18350 batteries with a sub-ohm atty would be highly dangerous. So now I'm just curious as to if I should just try to get rid of the batteries or continuing vaping like this until I can buy a Sony 18650. Again, I'm new to RBA's and I'm sorry for the long thread.. I just don't want to blow my hand up using two untrustworthy 3.7V batteries with a .56 ohm coil. Thanks for your answers in advance.. I'm hoping I can learn a lot from this forum in the future.