1. What is iPhone Battery Health?

Battery Health is a measure of your iPhone's battery capacity relative to when it was new. It indicates how much the battery has degraded over time and helps predict when you might need a battery replacement.

2. How Does the Calculator Work?

The calculator uses the battery health equation:

Where:

• \( current\_capacity \) — Current battery capacity in mAh
• \( design\_capacity \) — Original battery capacity when new in mAh

Explanation: The equation calculates the percentage of remaining battery capacity compared to the original design capacity.

3. Importance of Battery Health

Details: Monitoring battery health helps determine when to replace your battery, understand performance throttling, and maintain optimal device performance.

4. Using the Calculator

Tips: Enter current capacity and design capacity in mAh (milliampere-hours). Both values must be positive numbers. You can find these values in battery information apps or system reports.

5. Frequently Asked Questions (FAQ)

Q1: What is considered good battery health?
A: Above 80% is generally good. Below 80% may indicate it's time to consider replacing the battery.

Q2: Where can I find my iPhone's current capacity?
A: In Settings > Battery > Battery Health (for newer iOS versions) or using third-party apps like CoconutBattery or iMazing.

Q3: What's the typical design capacity for iPhones?
A: It varies by model (e.g., iPhone 13 ~3227 mAh, iPhone 12 ~2815 mAh, iPhone 11 ~3110 mAh).

Q4: How often should I check battery health?
A: Every 3-6 months is sufficient for most users, unless you notice rapid battery drain.

Q5: Does fast charging affect battery health?
A: Yes, frequent fast charging can accelerate battery degradation over time.