HP 6TP59EA User Manual page 55

When running Disk Defragmenter on computers with internal hard drives
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When performing a backup or recovery
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When you connect the computer to external power:
The battery begins to charge.
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The screen brightness increases.
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The Power icon
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When you disconnect external power:
The computer switches to battery power.
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The screen brightness automatically decreases to conserve battery charge.
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The Power icon
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changes appearance.
changes appearance.
Running on external power 43