I charged my battery up to 100% and I was just browsing online and watched a couple YouTube videos and my battery goes from 100% to like 85% in a 30 minute time frame. Is there something wrong with this Mac or will updating to mountain lion help fix this problem sice it's still on lion? I'm just a little concerned cause I don't think the battery should be that shot just after that little built of usage in such a short period of time, or maybe I'm just to used to the iPad, idk. Any recommendations?