HP Elite x3 User Manual page 28

Connect the lap dock to external AC power under any of the following conditions:
When charging or calibrating a battery
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When updating the firmware
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When you connect the lap dock to external AC power, the following events occur:
The battery begins to charge.
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If the lap dock is turned on, the battery charge level lights blink.
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When you disconnect external AC power, the following events occur:
The lap dock switches to battery power.
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The display brightness is automatically decreased to save battery life.
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22 Chapter 6 Power management