If you asked me what the Achilles' heel is for laptops, I'd probably say it's how the power seems to drain out at inopportune moments. To help me work longer on my laptop, Windows 7 runs with fewer background activities that use less power. Windows 7 also offers default power-plan settings that control how your laptop manages power. To access power management options, all you need to do is click the battery icon that appears at the far right of the taskbar and choose the option you want.
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Balanced. Offers full performance and display brightness when you need it, but conserves power when the computer is idle.
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Power saver. The best choice for extending battery life. On the downside, you get slower performance and lower display brightness.
How much power do you need?
You can also click More power options to open Power Options. From there, you can click the High performance power plan, which keeps the brightness, sleeps less frequently, and keeps the display on longer. This setting uses more energy than the others.