I have read many threads about the Cuboid fire button sticking, but mine has a completely different fire button problem. Mine is slowly failing... I need to press the fire button pretty hard to get the damn thing to fire now. So Im thinking of just replacing it. I love the display on it, so I'm thinking of going with the Evic VTC Mini or the Realeaux RX2/3. I really like my friends Realeaux RX200 but it's so damn big and heavy, so I like that i can use the RX2/3 in dual 18650 mode. But then I was reading that series mods don't give you anymore life than a single 18650, just doubles your amperage. So I'm currently testing with my wife's Evic VTC Mini. Wat does everyone here think? Will the dual 18650 be better than the single? I normally vape at 25-30w on my Subtank Mini at 0.75-1.0ohms. Once in awhile I casually vape at about 70w on my Griffin with dual Clapton coils (can't remember the resistance, 0.4 maybe?) Thanks in advanced all you smart people! 