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220-1201 Practice Question: That their laptop's battery drains quickly when…
A user reports that their laptop's battery drains quickly when connected to a USB-C docking station, even when the laptop is plugged into the dock's power delivery port. The dock supports 60W power delivery, but the laptop requires 65W. What is the most likely issue?
⚠ Common exam trap
The CompTIA A+ exam often tests the misconception that any USB-C cable or dock will charge a laptop as long as it's connected, ignoring the specific wattage requirements and the USB-PD negotiation process.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The dock's power delivery is insufficient for the laptop
The dock supports 60W power delivery, but the laptop requires 65W. When the power provided is less than the laptop's demand, the laptop will draw power from both the dock and its internal battery to meet the shortfall, causing the battery to drain even while connected. This is a classic case of insufficient power delivery from the dock, not a battery failure or cable issue.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The laptop's battery is failing
Why it's wrong here
A failing laptop battery would exhibit diminished capacity and rapid discharge regardless of whether it's connected to a dock or a standard power adapter, or even when operating solely on battery power. Since the user specifically reports the issue occurring when the laptop is connected to the dock, it strongly suggests the problem lies with the power delivery mechanism from the dock rather than a general degradation of the battery's health.
- ✓
The dock's power delivery is insufficient for the laptop
Why this is correct
When a dock's power delivery capability (measured in watts) is lower than the laptop's operational power requirements, the laptop will draw supplemental power directly from its internal battery. This continuous discharge, even while connected to the dock, prevents the battery from charging or maintaining its charge level, leading to the observed rapid battery drain. The laptop effectively uses its battery to bridge the power deficit.
- ✗
The USB-C cable is not rated for power delivery
Why it's wrong here
A USB-C cable not rated for Power Delivery (PD) or one that is faulty would typically prevent any significant charging current from reaching the laptop. In such a scenario, the laptop would not recognize a valid power source from the dock and would operate entirely on battery power, leading to a complete lack of charging rather than a slow discharge while supposedly connected.
- ✗
The laptop is running high-performance mode
Why it's wrong here
While running in high-performance mode significantly increases a laptop's power consumption, it would only cause battery drain if the power supplied by the dock was insufficient to meet this elevated demand. If the dock could provide adequate wattage, the laptop would simply operate at a higher draw without discharging its battery. The core issue remains the inadequacy of the power supply, not merely the increased demand from the performance setting.
Go deeper
Related to this question
Learn chapter
Laptop Hardware and Components
Key term
Universal Serial Bus
A Universal Serial Bus (USB) is a standard interface that allows you to connect devices like keyboards, mice, storage drives, and printers to a computer for data transfer and power delivery.
Key term
Laptop
A portable personal computer that integrates a display, keyboard, touchpad, battery, and internal components into a single clamshell device for mobile computing.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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