1. What is Battery Health?

Battery health indicates how much capacity your battery can hold compared to its original designed capacity. In Windows 11, this helps you understand when your battery might need replacement.

2. How Does the Calculator Work?

The calculator uses the battery health formula:

Where:

• Reported Capacity — Current maximum capacity of your battery (mWh)
• Designed Capacity — Original capacity when new (mWh)

Explanation: The formula compares your battery's current maximum charge capacity with its original capacity to determine degradation.

3. Importance of Battery Health

Details: Monitoring battery health helps predict remaining lifespan, plan for replacements, and understand when performance might be affected.

4. Using the Calculator

Tips: Enter both capacity values in milliwatt-hours (mWh). You can find these values in Windows 11 battery reports (run "powercfg /batteryreport" in Command Prompt).

5. Frequently Asked Questions (FAQ)

Q1: What's a good battery health percentage?
A: Above 80% is good, 60-80% means reduced performance, below 60% typically indicates replacement is needed.

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: Where do I find capacity values in Windows 11?
A: Generate a battery report with "powercfg /batteryreport" in Command Prompt, then check the "Battery capacity history" section.

Q4: Does fast charging affect battery health?
A: Yes, frequent fast charging can accelerate battery degradation over time.

Q5: Can I improve my battery health?
A: You can't reverse degradation, but avoiding extreme temperatures and keeping charge between 20-80% can slow further decline.