A freshly charged battery on a mech can put out 4.2 volts, but only for a little while, the majority of the battery life will be 3.7 volts, so you're vaping 0.5 volts higher on your spinner, and if that's where you like it, it would make sense that you'd like it more. If you want to make your k100 better, you could get a kick to make it vw