1. What is Battery Health Percentage?

The Battery Health Percentage indicates the remaining capacity of a car battery compared to its original specifications. It helps determine when a battery needs replacement before it fails.

2. How Does the Calculator Work?

The calculator uses the battery health formula:

Where:

• \( \text{Cranking Amps Measured} \) — Current cold cranking amps (CCA) measurement
• \( \text{Cranking Amps Rated} \) — Original CCA rating of the battery

Explanation: The formula compares the actual measured performance of the battery against its original specifications to determine remaining capacity.

3. Importance of Battery Health Calculation

Details: Regular battery health checks can prevent unexpected vehicle breakdowns, especially in extreme weather conditions when battery performance is critical.

4. Using the Calculator

Tips: Enter both measured and rated cranking amps in amperes (A). Values must be positive numbers. The measured value should be obtained from a proper battery load test.

5. Frequently Asked Questions (FAQ)

Q1: What is considered a good battery health percentage?
A: Generally, 80-100% is excellent, 70-80% is acceptable, and below 70% indicates the battery may need replacement soon.

Q2: How often should I check my battery health?
A: Recommended every 6 months, especially before winter and summer seasons when temperature extremes affect battery performance.

Q3: Where can I find my battery's rated CCA?
A: The CCA rating is printed on the battery label, usually in large numbers followed by "CCA".

Q4: How is measured CCA obtained?
A: Measured CCA requires a professional battery tester that applies a load and measures voltage drop. Many auto parts stores offer free testing.

Q5: Does this apply to all battery types?
A: This calculation is most accurate for lead-acid batteries (flooded, AGM, gel). Lithium-ion batteries have different health indicators.