Over the weekend I lost one of the batteries for my Jacvapour V1P kit, which is what I use when I'm out and about and can't carry much (or be responsible). Looking for a replacement, apart from buying it from Jacvapour themselves which seems a little pricey when you include shipping, I'm wondering which are the compatible ones I can get? Looking at my other battery it seems to have a different thread type than 510...