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 replacement.

2. How Does the Calculator Work?

The calculator uses the battery health formula:

Where:

• Current Maximum Capacity — The current actual capacity of your iPhone battery (in mAh)
• Original Design Capacity — The battery capacity when the iPhone was new (in mAh)

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

3. Importance of Battery Health

Details: Monitoring battery health helps determine when to replace your battery, prevents unexpected shutdowns, and maintains optimal device performance.

4. Using the Calculator

Tips: Enter both current maximum capacity and original design capacity in milliamp-hours (mAh). You can find these values in battery health settings or through diagnostic tools.

5. Frequently Asked Questions (FAQ)

Q1: What is a good battery health percentage?
A: 80% or above is considered good. Below 80% may indicate it's time for a battery replacement.

Q2: Where can I find my iPhone's current maximum capacity?
A: Go to Settings > Battery > Battery Health on iOS 11.3 or later.

Q3: How often should I check my battery health?
A: Every 3-6 months is sufficient for most users.

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

Q5: When should I replace my iPhone battery?
A: Consider replacement when health drops below 80% or you notice significantly reduced performance.