A question for the OP. Which coils are you using with the EVOD. The EVOD originally came with and used short stem coils. Kangertech within the last few months or longer, stopped making/selling those short stem in favor of the long stem protank coils as the protank coils work with the EVOD as well. My EVOD's used to leak and gurgle bad as well and I'd get more than a drop on the battery connection. It would flood that area and then start leaking out the air holes. Once I switched to the long stems, I never had a problem again with them.