I have one that is a total workhorse it was my first 2 battery mod. I had it dual using and it took some abuse, LOL, but I'm glad I have it as my beater mod to test new builds on, I don't mind if it gets leaked all over, and neither does it, it seems. Mine is an IPV-5, and I'm sorry I don't have much else for you. I'm not sure I'd buy another IPV either (mainly, they are heavy, and ugly) but I have to say the one I have definitely has its place in my stable.
I hope you get it sorted out.
Anna