📐 iPhone Battery Health Formula
True Health % = (Current Capacity / Original Design Capacity) * 100
- Original Design Capacity: The official mAh of your device when brand new
- Current Capacity: The MaximumFCC mAh found in Analytics-Year-Month-Day.ips
iPhone Battery Health Calculator (True Capacity)
The battery health percentage shown in iOS Settings is often rounded or delayed. If you want to know the true, decimal-accurate health of your iPhone or iPad battery, you can use the data from your device's analytics logs. Enter the original Design Capacity and the current MaximumFCC (capacity) below.
Input Parameters
mAh
mAh
Results
True Battery Health94.5%
Capacity Degraded179
Battery StatusExcellent / Normal
Visual Breakdown
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📝 Example
If your iPhone 14 Pro has an original design capacity of 3200 mAh, but your analytics log shows a MaximumFCC of 2850 mAh, your true battery health is (2850 / 3200) * 100 = 89.06%.
✅ Benefits
- •Find the exact decimal percentage of your battery health.
- •Check battery wear on iPads (which don't show health in settings).
- •Verify if your battery qualifies for an Apple warranty replacement (below 80%).
❓ Frequently Asked Questions
How do I find my MaximumFCC and Design Capacity?
Go to Settings > Privacy & Security > Analytics & Improvements > Analytics Data. Open the latest file starting with 'Analytics-'. Copy the text to a note and search for 'MaximumFCC' to find your current capacity, and 'NominalChargeCapacity' or search online for your iPhone's standard Design Capacity.
Why is this different from iOS Settings?
iOS deliberately rounds the percentage and updates it slowly to prevent user panic over minor daily fluctuations in battery chemistry. This calculator gives the raw, real-time chemical capacity.
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