I have been following this thread for a few days because I was surprised at how quickly my battery drains a full charge, and I wondered if there was something wrong.
I've come to realize that the people who come on here to help others have difficulty when a thread grows by leaps and bounds, from people other than the original poster chiming in with the same or similar problem.
However, I can understand why people who are having the same issue as the original poster gather in one place, around a topic, in spite of the fact they 'should' start their own thread.
For those of you who haven't found a solution to the fast battery drain, I have no solution. However, I have some 'anecdotal facts' if you please, that might (or not) be of importance to much more knowledgeable posters in pondering the issues shared in this long thread.
1) My most recent apple purchase is a MacbookPro Retina 13inch, mid 2014 model, which was shipped with Yosemite and then updated to Yosemite 10.10.2 operating system. So, I'm using a brand new macbook pro. I haven't even had it 2 weeks yet.
2) I have NOT installed anything, except system (and possibly safari) updates through the Appstore, except for one hidden object game from the App Store.
That game can run my battery down in 2 hours or less, with nothing else running, to my knowledge. Nothing else is opened by me or being used by me when I play it.
3) I haven't used my new macbook for anything other than browsing and playing that hidden object game, and I don't go to unsafe websites. It's never even been used to watch a youtube video. I don't have a Facebook account, and I haven't even set up mail on it yet.
4) A fully charged battery lasts me roughly 5 hours, just browsing with safari. I say roughly, because even though I've been having to charge it 2 or 3 times a day up to now, (I so far always let it go from full charge down to 10%, which causes the machine to tell me that I need to plug into power) something is improving. I just have no idea why, unless it has something to do with indexing, which I know nothing about, but I did see it referred to in this thread as being relevant to battery drain. Anyway, roughly 5 hours is actually an improvement, because for the first 7-8 days of use, a full charge drained in usually just over 4 hours, just from using safari. It drained in about 2 hours when playing the hidden object game, and still does. I've seen the little battery icon drop drastically, sometimes as much as 30% in 10 minutes, while playing that game. (No, I don't actually know what that means as far as anything to do with the game, or Yosemite or my machine, but it sure makes me think that game is a battery hog.)
5) The only tweaking I did on this new machine was to A... adjust my safari settings. I unchecked automatic safe downloads. I turned off the switch for plugins and extensions. I unchecked all the options to allow safari to save my passwords. and B... in preferences, I checked the option that decreases transparency. and C... I turned on firewall. and D...I turned off notifications. and E... I lowered the screen brightness.
I did all those settings during the first day of use, 9 (almost 10) days ago, with the exception of one; Just today, I did B.
I think that's the sum of my tweaking with settings. I might be forgetting something, but if I am, it would have been something simple like those settings. I don't do things that require much skill or knowledge with computers, because I don't know how and don't want to ruin a wonderful (to me) and expensive (for me) machine.
I have no idea what my experience means, if anything, in terms of whether or not the battery is functioning as it should, or whether it's because of Yosemite if it isn't. I don't know if it sheds any light on the issue about battery drain to someone with more knowledge.
Here's hoping it's of some practical use to someone, and not just adding length to this thread. If not, I apologize.