The title basically says it all. My Samsung Series 9 900X3C ultrabook's battery is in the deep red around barely three hours after disconnecting it from the power - and during most of that time the screen wasn't even on. No heavy lifting, no video playback, nothing. Just a browser with static sites was open.
Look into a tool called powertop, it should be in your repository. (
Also, if you have discrete graphics, such as Nvidia Optimus, could it be that the video card is powered up even when you're not using it? If so, try using Bumblebee (in your repo, again apt-get) to control when it's on and off. Or if you don't use discrete graphics, you can probably just turn it off entirely in the BIOS.
EDIT: Looks like there's a documented bug in Ubuntu/Linux/the driver. See these related questions too:
From that, it looks like you need to power down that audio output that's churning away. I'm not sure how, but I would go through that and experiment how. I found those questions and the bug, BTW, for searching "audio codec hwc0d0 powertop" - similar searches might be productive, as well as the discussion on that bug report.
Check the power consumption by your laptop using powertop and use TLP to fine tune it.
Check out below link how to use the utility: http://linrunner.de/en/tlp/docs/tlp-linux-advanced-power-management.html
This tool greatly helped me to reduce power consumption of my laptop.