How to save battery power

Tips to save battery power

Ever ran out of battery power in the middle of an important meeting or a long flight? Even with advances in technology, your laptop or tablet battery can last only so long on a single charge. The trick is to squeeze the most out of the power that's available.
Here are a few things you can do to help stretch your PC's battery life:
  • Choose a power plan that saves power. Windows 8 has two such default plans—Balanced and Power saver. To learn more about power plans and how to change them, go to Power plans: Frequently asked questions.


    • This doesn't apply to Windows RT or PCs with connected standby, because the only default plan for this type of PC is Balanced, though you can customize this to save more power. To learn how, go to Power plans: Frequently asked questions.
    • Your PC manufacturer might offer additional plans.
  • Reduce display brightness. The display can use more power than any other part of a PC.

    To change the display brightness

    1. Swipe in from the right edge of the screen, and then tap Settings.
      (If you're using a mouse, point to the upper-right corner of the screen, move the mouse pointer down, and then clickSettings.)
    2. Tap or click Brightness to make the change you want.
    Some PCs also have a dedicated button or dial to change the display brightness. To find out if your PC has it, check the info that came with your PC or go to the manufacturer's website.
  • Shorten the length of time before Windows dims and turns off the display. When you're not using your laptop or tablet —even for brief periods of time—you can save power by having Windows dim and then turn off the display after a period of inactivity.

    To choose when Windows dims and turns off the display

    1. Open Power Options by swiping in from the right edge of the screen, tapping Search (or if you're using a mouse, pointing to the upper-right corner of the screen, moving the mouse pointer down, and then clicking Search), enteringControl Panel in the search box, tapping or clicking Apps, and then tapping or clicking Control Panel. In Control Panel, enter Power in the search box, and then press Enter.
    2. On the Choose or customize a power plan page, on the left, tap or click Choose when to turn off the display.
    3. On the Change settings for the plan page, choose the display settings that you want to use for this power plan when your laptop or tablet is running on battery and when it's plugged in.
    4. Tap or click Save changes.


    • Doing this adjusts settings only for the power plan that you're currently using. To change settings for another one, tap or click Change plan settings next to the plan that you want to change on the Choose or customize a power planpage.
  • Turn off or remove devices that you aren't using. Many USB devices use power just by being connected, so you might want to unplug these devices when you're not using them. If you use a USB mouse, you can save power by replacing it with a touchpad or tablet pen.
  • Turn off PC cards and integrated wireless devices. These devices also use power, so turn them off if you don't need them.