iPhone Battery Health & Parts History: What to Check Before Buying

Two screens in an iPhone’s Settings tell you more about its past than any seller description: Battery Health and Parts and Service History. Together they show how hard the phone has been used, whether it has been opened, and whether the parts inside are the ones Apple put there.

Here’s where to find both, how to read every message, and how to turn the results into a fair price.

Where to find Battery Health

Open Settings › Battery › Battery Health & Charging (on some iOS versions simply Battery Health). You’ll see:

• Maximum Capacity — the battery’s capacity now compared with when it was new, as a percentage.
• Peak Performance Capability — whether iOS is limiting performance to prevent unexpected shutdowns.
• Charging options such as Optimized Battery Charging or, on newer models, a charge limit like 80%.

On iPhone 15 and later, iOS also shows the cycle count, the manufacture date and the date of first use of the battery. Depending on the iOS version these appear in Battery Health or under Settings › General › About. The first-use date is very useful: on a phone sold as “new”, it should be today or blank.

Menu names shift slightly between iOS releases, but these sections have been in the same places for several years.

What Maximum Capacity means

Apple designs batteries to keep up to 80% of their original capacity after a set number of complete charge cycles under ideal conditions: 500 cycles for iPhone 14 and earlier, and 1,000 cycles for iPhone 15 and later.

Messages to watch for

• “Your battery is currently supporting normal peak performance.” Good.
• “This iPhone has experienced an unexpected shutdown… performance management has been applied.” The battery is worn; the phone may feel slower.
• “Your battery’s health is significantly degraded…” Replace it soon.
• “Unable to verify this iPhone has a genuine Apple battery.” A non-genuine or unverified battery was installed. Battery health may not be shown at all.

Where to find Parts and Service History

Go to Settings › General › About and scroll down. On iPhone XR, XS, XS Max, iPhone SE (2nd generation) and later, a Parts and Service History section appears when parts have been replaced or the phone has been serviced. If the phone has never been repaired, the section is usually not shown.

Which parts are tracked depends on the model:

• Battery — iPhone XR, XS and later.
• Display — iPhone 11 and later.
• Camera — iPhone 12 and later.
• Newer models and iOS versions track more parts, such as the back glass and enclosure, Face ID and other components.

What each part status means

• Genuine Apple Part — the part is a genuine Apple part, installed with Apple’s repair process. This is fine, and often a plus: a new genuine battery or screen.
• Unknown Part — the part is non-genuine, couldn’t be verified, or wasn’t calibrated with Apple’s process. Common with cheap third-party screens and batteries.
• Used (on recent iOS versions) — a genuine Apple part that was previously used in another iPhone.
• Repair date / “Service” entry — may show when the work was done through Apple or an authorized provider.

Why an “Unknown Part” matters

Third-party parts aren’t always bad, but they change the value and behavior of the phone:

• Display: True Tone may be missing, color and brightness can be off, and touch may feel less responsive. Look at Settings › Display & Brightness to see if True Tone is available.
• Battery: health percentage may be hidden, and quality varies widely.
• Camera or Face ID: features can stop working entirely if the module isn’t genuine or properly paired.

Our guide to spotting fake and refurbished iPhones covers the other signs of an opened phone.

Combine the screens with an Apple records check

Settings tell you what’s inside the phone now. Apple’s records tell you its history. Before paying a premium price, run the serial or IMEI through these checks:

• All-in-one Basic Info — confirms model, color, storage and Find My status.
• iPhone warranty check — shows coverage and estimated purchase date, which you can compare with the battery’s first-use date.
• Replacement status check — tells you whether the unit was issued by Apple as a replacement.
• Part Number / MPN check — confirms the original configuration and region.
• Apple full GSX report — the full picture: sold-by, repair cases, replacement history and activation policy.

Start with the free check:

Questions to ask the seller

The screens tell you what changed; the seller can tell you why. Honest answers that match the screens are a good sign. Ask:

• “Has the phone ever been repaired, and where?” An Apple Store or authorized provider repair usually shows Genuine Apple Part. A street-market repair often shows Unknown Part.
• “Do you have the repair receipt?” A receipt for a genuine battery or screen replacement adds value and confirms the date.
• “Has it been dropped in water?” Water damage can affect the battery and charging long after the phone dries out.
• “How do you usually charge it?” Constant fast charging overnight and heavy gaming age a battery faster than the cycle count alone suggests.

If the seller says “never repaired” but Parts and Service History lists a replaced display, you’ve learned something important about everything else they’ve told you. Cross-check the official picture on our iPhone original check page.

Turning the results into a buying decision

1. Battery 85%+ and no parts history: original, well-kept phone. Pay a normal used price.
2. Battery replaced, marked Genuine Apple Part: a good sign — you’re getting a fresh battery.
3. Battery below 80% or “Service”: fine if the price reflects the cost of a genuine battery replacement.
4. Display marked Unknown Part: pay noticeably less, and check True Tone, brightness and touch carefully.
5. Face ID or camera marked Unknown Part, or features not working: walk away unless you’re buying for parts.
6. First-use date or warranty start years earlier than the seller claims: the seller isn’t being honest — reconsider the whole deal.

Need a specific report? Choose it here:

For official details on part statuses and battery service, search “iPhone parts and service history” on Apple Support.