Laptop battery doesn't last that long compared to Windows (Repeated)

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http://askubuntu.com – I'm using Ubuntu 12.10 with Gnome 3.6 on a Dell Inspiron N5010 laptop, but I have a problem with the power handling/battery. As soon as I disconnect my charger, the battery starts discharging from an indication of 51% and it lasts for only 1 hour. Compared two hours in Windows 7, this is a major difference. I've installed Jupiter and I don't see any change. I'd appreciate some help on this, as I would like to keep using Ubuntu now. (HowTos)