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Amazon.com: Dell Inspiron 1545 15.6-Inch Jet Black Laptop - Up to 4 Hours 34 Minutes of Battery Life, MS Home and Student Software Included (Windows 7 Home Premium) [Discontinued By Manufacturer] : Electronics
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Downgrading windows 10 to 7 increased battery efficiency 30 fold! [Lenovo x270] : r/Windows10
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