So I'm not new to vaping but new to the whole mod/coil building thing. Now i've tried searching for this question here and elsewhere but haven't been able to get a straight answer so i figured i'd ask myself. I'm still a little unsure what classifies as a "mod". I know there's mechanical ones and VV and VW ones. So my question is can you use something like the kanger subtank nano on a non mod rechargeable battery. For example, right now i have the vaporfi rocket battery with the rocket tank. I'm pretty sure it isn't considered a mod but it does have variable voltage, so I really don't get what the main difference is. I know people will probably say get a better/less expensive mod to replace it (which i probably will eventually anyway) but could i use an rba such as the the subtank with this vaporfi rocket?