To augment what CptJ explained, even though the *MATH* calculates out to 13.89 Watts, YOUR DEVICE may not be able to produce that amount of power. The MVP and the VV3 cap out at 11.0W. So, the combination offered will "work", but not at the calculated power output. (Volts will automatically be adjusted downwards to meet the 11.0 watt limit.)
You also need to factor in the AMPS that your battery can deliver. Ohm's Law V=IR (Volts = Amps * Resistance) is also necessary to consider because you have to make sure that your battery can deliver. Using the above numbers (and flipping the equation to solve for Amps) the current draw will be 2.7777777 (5.0/1.8). This "technically" is within the limits of the MVP/VV3 (which I believe limits at 3.0 A)
When you start considering rebuilding coils, you MUST know the limitations of your devices. Get an ohmmeter (there are bunches all over which will read the resistance of the built coil.) There's a gent out here named Baditude who has some incredibly informative blogs about battery safety and stepping up from "starter" devices.
Read up on battery safety. There are certain compositions which are preferred over others. Also need to look at Amp limitations to make sure you don't overdrive and potentially blow the battery/device. In the above example, for 65W builds, I'm going to guess about a .5 ohm coil.
Watt's Law: W = V^2/R. V = sqrt(65 * 0.5) = 5.7. Applying Ohm's Law, V = IR, solving for I, Amps = 5.7/0.5 = 11.4 Amps. You must make sure your batteries can SAFELY deliver the required amount of current to fire that coil.
Also have to look at battery life. VV3 is 800maH; MVP is 2600maH. basically means that MVP would last about 3 times longer before needing to recharge.
I have both VV3s and MVP2s. I'm not into sub-ohmming (yet?) I like running my 1.8 ohm coils around 10W....
I'm sure by now, a bunch of other people have responded, so if any of my ramblings are repeats, please forgive!
Good luck -- read up and be INFORMED before you jump in feet first. Define what it is you "want" (which after 6 months, I'm *STILL* doing

)