1. What is Battery Health Percentage?

Battery Health Percentage indicates how much charge your battery can hold compared to its original capacity when new. It's a key metric for understanding your laptop battery's condition and remaining lifespan.

2. How Does the Calculator Work?

The calculator uses the battery health formula:

Where:

• Full Charge Capacity — Current maximum energy storage (watt-hours)
• Design Capacity — Original energy storage when new (watt-hours)

Explanation: The formula compares your battery's current maximum charge capacity to its original capacity, showing what percentage of the original capacity remains.

3. Importance of Battery Health Monitoring

Details: Regular battery health checks help predict when to replace your battery, maintain optimal performance, and understand unexpected power issues.

4. Using the Calculator

Tips: Enter both capacities in watt-hours (Wh). You can typically find these values in your laptop's battery information or system diagnostics. Both values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is a good battery health percentage?
A: Above 80% is considered good. Below 60% may indicate it's time to consider replacement.

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

Q3: Where can I find my battery's capacity information?
A: On Windows, use powercfg /batteryreport command. On macOS, check System Information under Power.

Q4: Can I improve my battery health percentage?
A: While you can't reverse battery degradation, proper charging habits can slow further decline.

Q5: Is 100% health possible on an older battery?
A: No, all batteries degrade over time. A 100% reading on an old battery may indicate inaccurate reporting.