1. What is Battery Health Percentage?

The battery health percentage indicates how much of your battery's original capacity remains. As batteries age, their maximum charge capacity decreases compared to their original design capacity.

2. How Does the Calculator Work?

The calculator uses the battery health formula:

Where:

• Windows Reported Wh — Current full charge capacity reported by Windows
• Design Wh — Original design capacity of the battery

Explanation: The formula compares the current maximum charge capacity to the original capacity to determine battery wear.

3. Importance of Battery Health Check

Details: Regularly checking battery health helps determine when to replace your battery and maintain optimal laptop performance.

4. Using the Calculator

Tips:

• Find "Windows Reported Wh" in Windows battery report (powercfg /batteryreport)
• "Design Wh" is typically printed on the battery or available from manufacturer specifications
• Both values must be greater than 0

5. Frequently Asked Questions (FAQ)

Q1: What is a good battery health percentage?
A: Above 80% is generally good. Below 60% may indicate significant wear and reduced runtime.

Q2: How often should I check battery health?
A: Every 3-6 months for regular monitoring, or when you notice significantly reduced battery life.

Q3: Can I improve my battery health?
A: Battery wear is irreversible, but you can slow further degradation by avoiding extreme temperatures and full discharge cycles.

Q4: Why does my battery health decrease over time?
A: All lithium-ion batteries degrade with charge cycles, temperature exposure, and age.

Q5: When should I replace my battery?
A: Consider replacement when health drops below 60% or runtime no longer meets your needs.