Love my mini's with stacked IFR14250's for 6v vapin takes about 2sets for 3ml of juice but its an awesome little powerhouse
I had to teach Pietro how to do that, left to his own devices he has no imagination whatsoever.
With a 2.5 to 3ohm carto it will knock your socks off but really comes into it's own with and RBA which allows you to find your personal sweet spot.
I use an ERA, (even though by doing so I'm constantly told I'll be responsible for the end of humanity as we know it), and wrap coils in the neighborhood of 2.5 to 2.7 ohms with either bamboo yarn or cheesecloth wicks, the combination producing very good vapor, flavor and TH.
The two batteries get me through slightly over half of the three ml bottle so one spare set gives me more than enough power for an entire night out. I find that the small, black, zippered case that Mrs. T's Bakery included in my one and only order is perfect for holding two batteries, an extra bottle of juice and a carto in case I pop a coil on the ERA.
Although the VV Grand certainly gives you more versatility the Mini, with two 14250's provides a knock your socks off vape in a tiny sized package that can't be beat.
(Pietro never even thanked me for my vape changing advice. These young'uns never show respect for their wiser elders.)
Jack