You can also use efficiency calculator in Windows 7 to get information about power consumption of your laptop. This can help you to improve battery life and performance.
To use this feature open a command prompt as an administrator by typing 'cmd' in Start Search, and when the cmd icon appears, right-click it and choose Run as administrator.
Then type powercfg -energy in command line and hit Return, and Windows 7 will do the rest for you.
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