Battery Drains Very Fast After Installing Windows on BootCamp.

Hello,

I Bought MBP 13" Mid 2014 Retina Display last week and it wasn't a good start for me with Apple as I face the problem with FileVault and now with the battery. I had installed windows in my MBP through Bootcamp, but after installing it my battery drains vey quickly. It doesn't even last for more than two hours. Does anybody has any idea what should I do to fix this problem?