As I'm sure a lot of us have looking for that "perfect vape", I've got some mech mods, but as far as box mods I've only got the M80 Plus Xpro by smok, The IPV4, and the newer IPV3LI.. Now when I'm using a tank I'll keep the wattage at the same on the smok.. lets say 45 watts, then i'll set the wattage on my IPV3 LI for 45 watts and the Smok M80 either has higher wattage then it says it does, or the IPV 3LI has lower wattage then it says it does.. The Smok M80 gives me longer smoother hits with more vapor, at the same wattage, I'll even bump the wattage up on the IPV3 LI, but can't seem to get the same smooth draws as I do on my SMOK M80.. Is there any reason for this? I'm bummed because I like the IPV3 LI's touch sensor feature and from what I had heard was an overall great box mod. Why would there be such a difference in the two? I'm using Sony VTC 4'S in the IPV and the SMOK M80 comes with a charger with built in dual 18650's I believe, and seems to last a lot longere on a charge. Another weird thing with the IPV 3LI is that it was at a little bit under half a battery on the display screen, and bam just stopped firing, the batteries were too low to fire at 70 watts which I found very odd considering it had more then a 1/4th of the battery left.. is this normal too?