Everytime I read such an article I'm thinking "duh, of course it works" but apparently people still think it's not the case.
I do really, really, really wonder what's going to happen once battery usage is more efficient on Linux than on Windows. For in every thread about Linux on the desktop, there seems to be an endless flow of comments saying "I can get 11 hours of battery time on Windows, but I only get 10h40 minutes on Linux".
Linux powers billions, if not tens of billions of devices by now: trust me, it can power your desktop/laptop just fine.