User Guide - Windows 7

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When running Disk Defragmenter
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When performing a backup or recovery
When you connect the computer to external AC power, the following events occur:
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The battery begins to charge.
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If the computer is turned on, the power meter icon in the notification area changes appearance.
When you disconnect external AC power, the following events occur:
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The computer switches to battery power.
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The display brightness is automatically decreased to save battery life.
Setting power options 35