This is interesting - I regularly take my mini PT2s off my itaste vv v3 to swap out flavours, and will frequently find a bit of juice (or is it condensation?) on the battery connector. Is this a tank issue, or just normal? I always clean it off, and will often take the topper off after a vape break to clean it up. It's not a lot - just a drop.
Kanger coil head design with the hole in the middle. Wipe off those micro drops, clean with alcohol from time to time for good connection and you are good