You can greatly extend the battery life of your Lenovo ThinkPad by putting the computer to sleep when you are not actively using it. In the Sleep state, Windows 7 uses minimum battery power to keep the contents of the computer's memory active. The processor, screen and hard drive are turned off. An additional benefit is that your ThinkPad can resume from Sleep very quickly when you want to begin using it again. Sleep allows you to avoid waiting for the computer to perform a complete startup process when you turn it back on.
Open the Start menu, and click "Control Panel."
Click "Hardware and Sound."
Click "Change what the power buttons do," under the "Power Options" category.
Click both of the drop-down menus next to "When I press the power button." Select "Sleep" on each menu.
Click the "Save Changes" button.
Push the power button on your ThinkPad to put the computer to sleep. In the future, you can put the computer to sleep immediately by pushing the power button while the computer is running.
Click the blue Windows logo in the lower-left corner of the screen to open the start menu.
Click the "Sleep" button in the bottom-right corner of the menu. If you do not see the button, continue.
Click the arrow next to the button in the bottom-right corner of the Start menu, then click "Sleep" to put your ThinkPad to sleep.