[ubuntu] install nvidia drivers?

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http://ubuntuforums.org – Hey guys, I've been using ubuntu without installing any of the additional drivers. If I do click there, it says I should allow the installation of my nvidia 305m driver. I was wondering that if I did this, whether or not my battery life will decrease? Can someone tell me if it will or not? I feel like the nvidia card would eat up more battery. I have switchable graphics, so I wouldn't mind installing it, but only if I can switch back to my intel graphics also. Thank you. (Hardware)