I just removed iTunes...don't really need it there and I don't understand why it would run anything in the background. I disabled the run on startup option from it but to be safe, removed it.
Chrome is a different story. I need Chrome as there is an extension that I use for my work with SFDC and email tracking and syncing. I am careful that when I shut it down, I also don't let it run in the background as well. But, I understand that it is a battery hog.
However, despite all of that, it's always been on my machine and I haven't added anything else recently that would cause the battery to behave differently.
The only change that was made was downloading the firmware update from approx. 3 weeks ago that's supposed to "fix" issues. Each time I download it, something else happens. Prior to this battery issue, the last one caused my cursor on the keyboard cover to jump around randomly on the screen. Still does just not as much.