How to Check iPhone Battery Health: Maximum Capacity, Cycle Count & What Good Numbers Look Like

Battery health is the number-one thing to check on a used iPhone. Apple shows it right in Settings — no app needed. This guide shows you exactly where to look, what the numbers mean, and what counts as a good battery when buying a used iPhone in Pakistan.

Where to Find Battery Health in Settings

The menu path depends on your iPhone model:

• iPhone 15 and later: Settings → Battery → Battery Health. Here you see Maximum Capacity, Cycle Count, manufacture date, and first-use date — all on one screen.
• iPhone 14 and earlier: Settings → Battery → Battery Health & Charging. You see Maximum Capacity here; cycle count is not shown directly.

Settings kholein, Battery par tap karein — bas.

What "Maximum Capacity" Means

Maximum Capacity compares your battery's current capacity with when it was new. A phone at 87% holds 87% of the charge it held on day one. As the percentage drops, the phone needs charging more often and may struggle at peak performance.

What Counts as Good? (Benchmarks)

For a used iPhone, aim for 85% or higher. Below 80%, budget for a battery replacement soon after purchase — or negotiate the price down.

Cycle Count: The Battery's Odometer

A charge cycle is counted each time you use 100% of the battery's capacity in total — not necessarily in one sitting. Use 60% today and 40% tomorrow, and that counts as one cycle. Apple's design targets:

• iPhone 15 and later: retain 80% capacity at 1,000 complete cycles.
• iPhone 14 and earlier: retain 80% capacity at 500 complete cycles.

On iPhone 15+, the cycle count is right on the Battery Health screen. On older iPhones, find it via Settings → Privacy & Security → Analytics & Improvements → Analytics Data: open the latest log-aggregated file and search for batterycyclecount.

Red Flags: "Boosted" Batteries and Fake Readings

In the Pakistani used market, some sellers flash batteries to show an artificially high percentage. Watch for these:

• Capacity doesn't match the cycle count. A phone showing 95% capacity with 800 cycles is suspicious — a genuinely used battery at that cycle count would be much lower. Numbers aapas mein match hone chahiyein.
• "Unknown Part" / "Important Battery Message". If iOS cannot verify the battery, treat the percentage as unreliable and get the phone inspected.
• "Service" recommendation at high capacity. A battery labelled "Service" while showing 90%+ suggests a replaced or tampered battery.
• Peak Performance Capability warnings or unexpected shutdowns during testing — the battery is degraded regardless of what the percentage says.

Quick Battery Test Before You Buy

1. Check Maximum Capacity and cycle count (85%+ preferred).
2. Use the phone for 10–15 minutes on mobile data with the screen on — the percentage should drop gradually, not in jumps.
3. Open the camera and record a short video; a weak battery often shuts the phone down under load.
4. Confirm there is no "battery message" warning in Settings.