If I may, a piece of experience to all:
I've owned my share of PVs, and always budget constricted, I tried to buy the best I could without breaking the piggy. And the conclusion is that replaceable battery mods (with a few exceptions, of course) will last more or less than fixed battery mods. Case scenario, my Innokin SVD failed after 3 months (button stopped firing) but the MVP lasted a whole year, after getting dropped to concrete, marble and ceramic floors. And it cost half!
And, on the other hand, who knows what the future might bring? the quest for the smallest, most powerful mod, as well as fashion hasn't ended yet. So if it hasn't failed, you'll replace it inside of a year for something more powerful. True, sometimes you don't have time and you have a freshly charged battery. But for the money of that mod plus 2 batteries, you can buy 2 discardable PVs of more or less the same power, and throw them away without remorse when you're done. Or PIF.
So, budget hands again. I keep a replaceable and 3 fixed PVs for that same reason. I'm just trying to prove a point.
Be well everyone!