iPhone battery health is one of the first things to verify when buying a used iPhone. A low percentage does not always mean walk away, but it does mean you need to factor in what a replacement costs. Here’s where to find it, how to read the number, and how to use it to your advantage. For the bigger picture on which models to target, start with our used iPhone buyer’s guide.
Quick Answer
Open Settings > Battery > Battery Health & Charging and look at Maximum Capacity. For a used iPhone, 80% or above falls within Apple’s normal operating range. Below 80%, Apple’s own service message will typically appear, so build the cost of a swap (around $99 for most current models, varying by model) into your negotiated price. On Swappa, sellers are required to disclose when battery health is below 80% and the Apple service message is showing.
Where to Find Battery Health on an iPhone
Starting with iOS 16, the path is:
Settings > Battery > Battery Health & Charging
That screen shows two key metrics:
- Maximum Capacity: the percentage of original battery capacity the phone still holds. 100% is brand new. Gradual degradation is normal over time and with charge cycles.
- Peak Performance Capability: tells you whether iOS has applied Performance Management, which throttles CPU and GPU speed to prevent unexpected shutdowns caused by a worn battery.
If a seller sends photos before purchase, ask for a screenshot of this screen. It takes about five seconds to pull up, and any legitimate seller will have no problem sending it.
One note on charge cycles: unlike Macs, iPhones do not display cycle count directly in Settings. Some third-party apps can surface this data, but the Maximum Capacity percentage is the most reliable and accessible number for buyers. Focus on what you can verify.
Battery health is one input into a device’s overall condition. For how capacity and wear fit into condition grading across all used electronics, see battery health in used electronics.
What Percentage Is “Good” for a Used iPhone
Here is a practical breakdown:
| Maximum Capacity | What It Means | Buyer Takeaway |
|---|---|---|
| 90 to 100% | Excellent. Minimal degradation. | Buy with confidence. Battery is close to new. |
| 80 to 89% | Good. Normal for a one to two year old phone. | Acceptable for most buyers. Within Apple’s threshold. |
| Below 80% | Apple recommends battery service. | Factor in around $99 for a replacement. Can still be a good buy at the right price. |
| Below 70% | Significant degradation. | Expect noticeably shorter battery life. Negotiate hard or move on. |
These are buyer guidelines, not rigid rules. A 78% battery on an iPhone 15 at a steep discount may be a better deal than a 92% battery on an older model at full asking price. The percentage is one variable. Price is the other.
Swappa sets no minimum battery health percentage to list a device. The requirement is a fully functional battery, defined as one that properly charges and discharges. The 80% threshold is where Apple’s own service message appears, which is why it matters as a buyer reference point.
Battery health also shapes what a phone is worth at resale. Our used tech resale value guide covers how condition drives pricing.
When Low Battery Health Is Fine (and When to Walk)
When it is fine
A lower battery health percentage is not automatically disqualifying. A few scenarios where it works:
- You are buying a budget device for light use. If someone mainly uses the phone for calls, texts, and occasional browsing, a battery in the mid-70s may hold up adequately for another year.
- The price already reflects the condition. If a seller prices a phone $80 to $100 below comparable listings because of battery health, you are essentially being handed the replacement cost at a discount. Run the math before deciding.
- You plan to replace the battery immediately. Apple Authorized Service Providers and Apple Stores can replace most current iPhone batteries for around $99. Check Apple’s current pricing for your specific model, as it varies by generation. [VERIFY URL: support.apple.com/iphone/repair/battery-replacement] Factor that into your offer.
When to walk
- The seller will not disclose. Ask for a Settings screenshot and any deflection is a red flag. It takes seconds, and there is no legitimate reason to refuse.
- Battery health is below 70% and the price is not discounted. You would be overpaying and inheriting a repair.
- Performance Management is active. The phone is already throttling itself to avoid shutdowns. Day-to-day performance will feel inconsistent until a new battery is installed.
- The phone will not hold a charge at all. That goes beyond battery degradation. A battery that does not charge and discharge is outside Swappa’s listing standards entirely.
Battery Replacement Cost: Factor It Into Your Offer
Apple’s battery replacement service runs around $99 for most current iPhone models, though pricing varies by model and changes periodically. Older models may be less. Check Apple’s battery service page for current pricing before you negotiate.
The math is straightforward. If a used iPhone 14 with 75% battery health is listed at $350, and the same model with 90% or better is selling for $400 on Swappa, that $50 gap does not cover a battery swap. You would be better served either negotiating the listing price closer to $275 to $300 to account for the repair, or paying up for a higher-health phone and skipping the hassle.
You can browse current used iPhone prices on Swappa to calibrate what “fair price for the condition” looks like before you message a seller. Live pricing data gives you a realistic anchor for any negotiation.
If you’re still deciding which model to buy, our guide to used iPhones by generation breaks down value model by model.
What to Ask a Seller Before Buying
Most of this can be confirmed before you commit. Here are the questions worth asking:
1. Can you send a screenshot of Settings > Battery > Battery Health & Charging?
This is the fastest way to verify Maximum Capacity and whether Performance Management is active.
2. Is the Apple battery service message showing?
On Swappa, sellers are required to disclose if battery health is below 80% and the service recommendation is active. If that information is not in the listing, ask directly.
3. How does the phone hold up on a typical day?
Sellers often have useful context. “Gets me through a full day” versus “I charge it twice” tells you something the percentage alone does not.
4. Has the battery ever been replaced?
A replaced battery resets the percentage but introduces a new variable: whether it was replaced through Apple or a third-party shop. On iPhone models from 14 onwards, Settings will display a parts and service notice if the battery was not installed by Apple. That is not necessarily a dealbreaker, but worth knowing before you pay.
Battery is one checkpoint among several. For the full pre-purchase walkthrough, see how to inspect a used phone before you buy.
Buying a Used iPhone on Swappa
Swappa’s listing standards require sellers to disclose battery health below 80% when Apple’s service message is active. Listings are staff-reviewed and must meet verified criteria: clean IMEI, ready to activate, no Activation Lock, no water damage, no cracked glass, and a fully functional battery that charges and discharges.
If a phone is not as described when you receive it, you are entitled to a refund. Swappa’s support team is available 24/7 with typical response times around 20 minutes. Payments through PayPal include built-in buyer and seller protections and dispute resolution.
Fees are straightforward: a flat 3% buyer fee plus payment processing, which is lower than auction-site fees on comparable purchases. Browse used iPhones on Swappa to find verified listings with disclosed condition details.
Frequently Asked Questions
What is a good battery health percentage for a used iPhone?
80% or above is the practical benchmark. Apple recommends battery service when capacity drops below 80%, so anything above that is within normal operating range. For a phone that is one to two years old, 85 to 92% is common and acceptable. Below 80%, factor a replacement into the price rather than treating it as a reason to walk automatically.
Where do I find battery health on an iPhone?
Go to Settings > Battery > Battery Health & Charging. The Maximum Capacity percentage appears at the top of that screen. This path applies to iOS 16 and later.
Should I buy a used iPhone with 79% battery health?
It depends on the price. At 79%, Apple’s service recommendation is likely showing, which means you should price in a battery replacement (around $99 for most current models, varying by model). If the seller has priced accordingly and the gap is sufficient, it can still be a fair deal.
Does Swappa require sellers to disclose battery health?
Swappa requires sellers to disclose when battery health is below 80% and the Apple battery service message is active in Settings. All listings must include a fully functional battery that charges and discharges normally. There is no minimum percentage required to list, but the disclosure rule is firm.
Can iPhone charge cycles be checked in Settings?
No. Unlike Macs, iPhones do not show cycle count in the standard Settings menu. Some third-party apps can access this data, but the Maximum Capacity percentage in Settings is the most reliable and accessible metric for buyers evaluating a used iPhone.
What does “Performance Management applied” mean on an iPhone?
It means iOS is actively limiting processor speed to prevent unexpected shutdowns caused by a degraded battery. The phone will run below its rated performance until the battery is replaced. This is a separate indicator from Maximum Capacity and worth checking before you commit to a purchase.
The Bottom Line
iPhone battery health is a concrete, checkable number that should influence what you pay, not necessarily whether you buy. Ask for the screenshot, run the math on a potential replacement, and use the percentage as a negotiating tool. On Swappa, sellers with batteries below 80% are required to disclose that upfront, which takes the guesswork out of the most common used iPhone concern.
Related reading: the used iPhone buyer’s guide for picking a model, and used electronics condition grades for how battery health fits into overall condition.
