I can't see any benefit to a complete wipe. I'd leave OS X on it otherwise your stuffed for firmware updates , new boot camp drivers etc plus I can't see Apple being too amused if it needs warranty work. You can shrink the OS X partition down to 8GB and use the rest for Windows.
http://www.zdnet.com/the-other-hidden-cost-of-running-windows-on-a-mac-battery-life-7000000906/
This old article was released before Mavericks which adds a whole new level of halting states to the OS. So before it was about 2/3rds of the battery life with windows. Now the battery life is improved in OSX.
Wasn't sure if removing a whole layer of software would increase battery life. That's the main question. I guess the important bit would be whether the drivers for motherboard features would work natively on Windows. I assume as well you could do a clean wipe and reinstall OSX back onto the Mac.