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Difficulty: MediumLaptop Power Systems and Battery Management

A technician receives a corporate laptop from a remote worker who reports that the system suddenly powers off without warning when running on battery power, even though the battery indicator displays 35% remaining capacity. Diagnostic utility logs reveal that the battery's maximum full charge capacity has degraded to less than 15% of its original design capacity, causing steep voltage drops under load. Which of the following is the MOST appropriate resolution to address this issue?

  1. Replace the laptop battery with a compatible new battery pack.Answer
  2. B
    Perform several complete battery discharge and full charge cycles to recalibrate the fuel gauge sensor.
  3. C
    Connect the laptop to a higher-wattage Thunderbolt AC adapter to override the power delivery negotiation.
  4. D
    Disable CPU power management and dynamic frequency scaling in the system BIOS/UEFI settings.

Answer

Replace the laptop battery with a compatible new battery pack.
Replacing the battery pack addresses the hardware degradation where reduced capacity and high internal resistance cause voltage drops under workload spikes, leading to system shutdown.

Step-by-Step Solution

1
Analyze diagnostic logs and symptoms.
Identified that the battery's full charge capacity has degraded significantly compared to its original design capacity, causing dynamic voltage failure under load.
Lithium-ion battery degradation causes increased internal resistance, leading to sudden power loss when the CPU requests peak power.
2
Evaluate potential solutions against Lithium-ion battery behavior.
Hardware replacement is required because chemical degradation in Lithium-ion cells cannot be fixed via software recalibration or configuration changes.
Recalibration only syncs percentage estimation software and does not restore physically lost electrical storage capacity.
3
Select the proper resolution step.
Replacing the degraded battery pack restores full capacity and stable operating voltage.
A replacement battery ensures reliable mobile operation without unexpected shutdowns.

Key Concept

Laptop Battery Degradation and Replacement
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Topics

Laptop Power Systems and Battery Management

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