easyMultiple ChoiceObjective-mapped
FC0-U71 Practice Question: That their laptop battery drains quickly even…
A user reports that their laptop battery drains quickly even when plugged in. What is the most likely cause?
⚠ Common exam trap
Many exam-takers assume a battery drain while plugged in must be a battery fault, but the CompTIA FC0-U61 exam tests understanding that the power adapter's output capacity is the first thing to verify in such a scenario.
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 power adapter is not delivering enough voltage
When a laptop battery drains quickly while plugged in, the most likely cause is that the power adapter is not delivering enough voltage or current to simultaneously power the system and charge the battery. This can occur if the adapter is undersized, damaged, or not the original equipment manufacturer (OEM) specification, causing the system to draw power from the battery even when connected to AC power. A faulty battery would typically fail to hold a charge at all, not drain while plugged in.
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 battery is faulty
Why it's wrong here
A faulty battery may not charge, but the laptop should run on AC power without draining.
- ✗
The laptop is set to high performance mode
Why it's wrong here
High performance mode increases power consumption but does not cause drain when plugged in.
- ✓
The power adapter is not delivering enough voltage
Why this is correct
If the adapter is underpowered, the laptop may supplement with battery power, causing drain.
- ✗
The CPU is overheating
Why it's wrong here
Overheating may cause throttling but not battery drain while on AC.
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One of 988 original FC0-U71 practice questions on Courseiva, each with a full explanation and wrong-answer analysis — not exam dumps or protected exam content. Learn why practice questions differ from exam dumps →
JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This FC0-U71 practice question is part of Courseiva's free CompTIA certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the FC0-U71 exam.