Chrome has turned into a battery life hog on pretty much every platform, it seems. Here's Jared Newman, writing about the bug which makes Chrome eat up your laptop's battery on Windows:
In a statement to PCWorld, the company noted that the bug has been assigned internally, and that the Chrome team is working to fix it—though only after Morris shined a spotlight on the issue. The long-standing bug report has been bumped up to priority one.
Not just Windows: in my experience, Chrome is a major battery hog on OS X, literally halving the life of my MacBook Pro compared to the latest version of Safari. Whether this is Chrome being wildly inefficient or just better code in Safari, I don't know, but it means that at the moment Chrome just isn't a viable option to use on the Mac.