I have a different opinion on this. I have a set of HG2 button tops. The only mods that I am comfortable using them in is my 2.5's and P3. Most other vape mods have very little "travel" in the spring loaded pin. The HG2 is about a mm or so longer than a standard flat top or AW button top.can I use button top lg hg2 batteries in my provari mini ?
The P2/P2.5 end cap has a very thin spring with enough travel that it can handle the slightly longer length. This is my personal opinion, based on screwing on the end cap and not finding it overly tight. In fact it does not feel tighter than an AW because the spring is not very robust and has plenty of travel built into it.
I did these tests on a standard P2.5 with a standard extended end cap. The mini does not accommodate 18650 with the stock parts. I am assuming you acquired an extra extension tube to take it from the stock 18490 max size to 18650?
I don't recall using the HG2 button tops for any length of time in my P2.5s because I usually use them with the shorter batteries. If you take my word for it I won't be responsible for the board breaking loose. I just don't see any reason why it would. Caveat Emptor, though.