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Windows 7 has introduced several new energy saving measures to extend the battery life of your notebook. A very visible feature is the way the laptop screen turns off after a while. These power-saving features have been further enhanced under Windows 8/10.
Adaptive display brightness
Windows 8 or Windows 7 extends the battery life of your notebook with a Adaptive Display Brightness feature. This function automatically attenuates your laptop screen when it detects that your computer has not been used for a certain time or after a certain period of time.
This is comparable to what most cell phones do.
Windows users know how to manage Windows 7 power plan settings, advantages and disadvantages of different power plans, and troubleshooting Windows 7 power plans. Windows 8 users are also aware of the process of managing power settings and creating custom plans on their Windows 8 PC. But if you want to know more, you can read this article on how to maintain battery performance and extend battery life.