Battery life issue with fedora 18

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http://forums.fedoraforum.org – I have an old laptop(5+ years) running fedora 18, It has core2duo processor and I have recently replaced its battery. With Windows battery life is about 3-3.5 hrs but with fedora 18 running gnome-shell it is hardly 2 hrs. I will be getting a new laptop with AMD A10 processor, Richland architecture in about a week. I am concerned about the battery of that laptop If I run Fedora 19 Gnome or KDE. Any suggestions, or documents explaining how to prolong battery life running fedora?? (Believe me I really really don't want to install anything else on it, let alone Windows 7) I had very cr (HowTos)