Do you have a Windows 7 installed laptop or netbook and want to get more battery life out of it? Windows 7 has a hidden built-in tool for diagnosing the power efficiency of the system which many people are not aware of. This tool will examine the laptop’s energy usage and make recommendations on how to improve it.
Read this before you go forward – Best Practices to Improve Laptop battery Life (Will Open in a new Window)
Steps to use the Tool
1. Open a command prompt as an Administrator. To achieve this Go to All Programs ->Accessories-> Right click on Command Prompt->Choose Run as Administrator
2. In the command prompt type the following
powercfg -energy -output Desired FolderEnergy_Report.html
3. Within a minute, Windows 7 will examine the behavior of your laptop and then will analyze it. Then it will create a report in HTML format in the folder you specified. 
4. Open the file and you’ll get the report.
5. Follow the recommendations for the ways to improve power performance.
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