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Difficulty: HardLaptop Power Systems and Battery Management

A field technician is troubleshooting a corporate laptop used by a remote employee. The employee reports two distinct issues: first, the laptop rapidly drains its battery and displays a low-power warning while plugged into a multi-port USB-C dock at a client site. Second, after the employee attempted to calibrate the internal Lithium-ion (Li-ion) battery by performing repeated deep discharge cycles down to 0%, the overall battery runtime degraded significantly. Which TWO of the following explanations or resolution steps correctly address the root causes of these issues? (Select TWO.)

  1. Advise the user that modern Lithium-ion batteries do not suffer from memory effect and that repeated deep discharges to 0% cause chemical stress and permanent capacity loss.Answer
  2. Verify that the laptop is connected to a USB-C port that supports Power Delivery (PD) input, as physical USB-C ports may be restricted to data transfer or video output only.Answer
  3. C
    Instruct the user to run five consecutive deep discharge and 100% recharge cycles to clear the battery's chemical memory effect and reset the power gauge.
  4. D
    Assume any physical USB Type-C cable and port combination automatically negotiates maximum wattage because the USB-C standard mandates uniform Power Delivery across all ports.
  5. E
    Replace the internal laptop system memory with standard desktop DDR4 DIMM modules to reduce total system thermal and power draw during dock operation.

Answer

The correct responses state that modern Lithium-ion batteries degrade chemically from repeated deep discharges down to 0%, and that the technician must verify whether the laptop USB-C port in use supports Power Delivery (PD) charging input.
The correct choices correctly identify the characteristics of laptop power infrastructure. First, Lithium-ion batteries do not have memory effect, and deep discharging them to 0% inflicts structural and chemical damage on the cells. Second, physical USB Type-C connectors carry different capabilities depending on the underlying motherboard bus and controller; charging requires a port explicitly wired for USB Power Delivery (PD) input.

Step-by-Step Solution

1
Analyze the battery degradation symptom.
Identify that Lithium-ion (Li-ion) chemistry does not experience memory effect; deep discharging to 0% accelerates battery health loss.
Modern laptop batteries prefer shallow discharge cycles and operating within partial charge thresholds (e.g., 20%–80%).
2
Analyze the charging failure when connected to the USB-C expansion dock.
Recognize that physical USB-C ports on laptops have varying controller feature sets.
Connecting a power source/dock to a USB-C port that only supports USB data or DisplayPort Alt Mode will fail to charge the system.

Key Concept

Laptop Power Systems and Battery Management
Estimated Time:2m 0s
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Laptop Power Systems and Battery Management

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