It's been a few years since I have decided to upgrade what I have been using. Currently, I am using a Kanger subox Mini w/ Kanger Subtank Mini (0.5 coils). I do not use the RBA because I am not confident in my ability to rebuild an atomizer; it's easier to just buy new ones and use them until they are done. Can someone recommend me something similar in size (nothing larger please) that has passthrough capabilities, variable voltage/variable wattage (possibly variable temperature, although I'm not sure on how this works I haven't been keeping up with the new technology.) The reason I am deciding to upgrade is because the charging port on my system is faulty and I have not been able to charge my battery through it or use it as a passthrough. I thought about buying the newer Subox, or Topbox as I see it being called now, because it seems they fixed some things with it. However, if the tank is still the same, I have a lot of leaking issues with it.