Yes, basically what FishGuy said... Charger, battery, tank, spare coils, and juices...
I've had coils last only a week before they became obvious they needed changing (lack of flavor, hard to draw, leaking, etc), and I've had some last a month or longer... that is why you need spares, as they will always "Go South" on you at the least opportune moments
Same thing for Batteries goes for coils... and tanks... you'll want to have at least two of everything... (or more). Your VV3 is a good battery, but what if it becomes damaged or loses charge in the middle of the day? You need a back-up battery, even a smaller or cheaper one... doesn't have to be another VV3. Spare tanks and coils are always a must-have as you try new juices, too... easier to pop in a new flavor into a fresh tank than to take the time to clean out your ONE tank and wait for it to dry, or have flavors mixing that you don't want mixed.