From the sounds of things, that sounds about right. Is your preference tube/stick mods, or would you be into a box mod? A dual battery removable, rechargeable box mod might be better suited for your vaping/power needs. There are startup costs, including an external charger, at least two sets of married batteries for easy switching them out, and the mod itself. Batteries and a charger are both fairly inexpensive, but you want to make sure you get authentic batteries from a reputable supplier as well as a decent charger (which can be purchased quite inexpensively especially if it's two bay) might want to check out
Mooch's blog | E-Cigarette Forum, there's a table that will give you various battery specs for vaping and a list of reputable suppliers... Every time I try to copy the table, I fail, but it's easy to find.
Your other option as others have said is to have two (or more) smok sticks in rotation so that you can get through the day while charging your other batteries. That sounds a bit unwieldy to me, but whatever works best for you.
It does sound like your wattage needs are higher than what that battery can deliver, though.
Best of luck,
Anna