An iPhone that still has 15% battery left at the end of the day feels very different from a device that is already asking for a charger around lunchtime. That is why how to check iPhone battery health is a smart question, especially if you are considering a used or refurbished iPhone. Battery health does not tell the whole story, but it does provide quick insight into the expected runtime and potential performance of the device.
The check usually takes less than a minute. What is more important is what you do with that information afterward: for example, a percentage of 85% does not automatically mean an iPhone is unsuitable. It depends on your usage, the model, and your expectations.
Checking iPhone battery health in Settings
On most recent iPhones, you can find the battery health via Settings > Battery > Battery Health & Charging. There, you will see a percentage next to Maximum Capacity. This percentage compares the current capacity of the battery to its capacity when it was new.
If it says 100%, the battery can theoretically still store the full original amount of energy. At 90%, that is slightly less. You will notice this primarily on days with a lot of screen time, video calling, navigation, social media, or mobile internet. Those who use their iPhone mainly for messaging, calling, and occasional web browsing can still get by just fine with the same battery health.
In this screen, you may also see information about peak performance. The iPhone can manage performance when a battery has aged and a sudden shutdown is imminent. Read any message carefully: it is not a judgment on the entire iPhone, but a signal that the battery might need attention.
Some newer models display additional battery data, such as the number of charge cycles. That is useful extra information, but for most buyers, the maximum capacity percentage remains the easiest starting point.
If you do not see Battery Health
If you do not see this option, first check if the iPhone has the latest available version of iOS installed. On older devices or certain software versions, the menu labeling may vary slightly. If you still cannot find it, a specialist can further inspect the battery and the device.
Also, pay attention to messages like "unknown part" or a notification that battery information cannot be verified. Such a message deserves extra attention when buying second-hand from a private individual. You will have less certainty about which battery has been installed and whether the information displayed is fully reliable.
What does the battery health percentage mean?
A battery wears out gradually. This is normal with lithium-ion batteries and happens with every smartphone. Frequent charging, heat, prolonged gaming, and years of daily use can cause capacity to decrease.
As a practical guideline, a battery health of 90% or higher is still very comfortable for many people. Between 85% and 89%, you can generally still get by well, although intensive use will likely require a charge sooner. Below 80%, the chance that you will truly experience the battery life as limited increases, especially with older iPhone models that have smaller batteries.
However, it is not wise to look only at that single number. An iPhone with 86% battery health and a large screen or efficient processor may last longer in practice than an older, compact model at 90%. Your own usage also makes a difference. Someone who is on the road all day without a power outlet has different requirements than someone who can easily charge at home or at the office.
Maximum capacity is not an exact daily forecast
The displayed maximum capacity is an indication. Two iPhones with the same percentage can feel different in daily use. One user has many apps running in the background, uses 5G, and streams video. The other mostly calls, sends messages, and uses Wi-Fi.
Additionally, temperature, network reception, and screen brightness play a role. With poor reception, an iPhone has to work harder to stay connected, which can drain the battery faster. Therefore, evaluate the condition in context with the device as a whole, rather than in isolation.
When is replacing a battery a wise choice?
Replacing a battery makes the most sense when you experience clear inconvenience. Think of unexpected shutdowns, a noticeably rapid drop in the percentage, a device that reacts sluggishly due to performance management, or a maximum capacity that is low and no longer fits your daily needs.
If you are still fine with charging once a day and the iPhone otherwise works well, a lower percentage does not necessarily require immediate action. A new battery extends the practical lifespan, but it does not change the camera, storage capacity, or speed of an older model, for example. Sometimes a battery replacement is the most economical choice; sometimes a newer refurbished model better suits your needs.
In the event of visible swelling, excessive heat, or a battery that drains quickly and unpredictably, it is wise not to continue using the device as if nothing is wrong. Have it evaluated in such cases.
Checking battery health on a refurbished iPhone
Anyone buying refurbished wants no surprises after the first week. Therefore, always ask clearly about the provider's battery policy. Has the battery been tested? What is the minimum battery health maintained? And what happens if your battery does not function well in practice?
At Refurbished.nu, iPhones are professionally checked before they are offered for sale. This provides more certainty than a private purchase, where you often only get a screenshot or a verbal promise. After receiving the device, check the battery health yourself in Settings. This way, you know exactly where you stand and can test the device within the return period.
Do not just look at the battery. Also, check if charging works normally, the cable connects properly, the screen is responsive, and the iPhone shows no unexpected messages. A reliable provider offers clear terms and conditions, 2 years of warranty, and sufficient time to evaluate if the device suits you.
Ask these questions before you buy
With a refurbished iPhone, three questions are usually enough to make a good comparison. Ask what minimum battery health is provided, whether the battery is covered under warranty in case of defects, and whether you are allowed to return the device if it does not meet your expectations. Clear answers often say as much as a high percentage.
A lower price is attractive, but a device must also be practically reliable. For a student, a compact budget model with a good battery might be fine. For someone who travels a lot, uses navigation, or needs to remain reachable for business, a model with a larger battery or newer energy efficiency might be the better choice.
How to get more out of your current battery
You do not need to constantly watch your battery percentage. A few habits can help reduce the strain on the battery. Preferably use a quality charger, avoid prolonged heat, and do not leave the iPhone in a hot car unnecessarily. Extremely low or constantly fully charged batteries are also not ideal if that happens daily.
The optimized battery charging feature can be useful if you often charge at the same times. The iPhone learns your routine and can delay the final part of the charging process. The effect varies by user, but it takes little effort to keep the feature enabled.
Do not expect miracles from closing every app or constantly switching settings. If your battery health is truly low, small savings will not solve the wear. At best, they can help you get through the day more comfortably.
A battery is not a detail you only look at when the iPhone dies. Check the percentage, see how the device behaves in your daily life, and choose a solution that fits. That way, you buy not only affordably but also with expectations that are accurate.
