Understand iPhone performance and its relation to your battery.
Your iPhone is designed to deliver an experience that is simple and easy to use.This is only possible through a combination of advanced technologies and sophisticated engineering. One important technology area is battery and performance. Batteries are a complex technology, and a number of variables contribute to battery performance and related iPhone performance. All rechargeable batteries are consumables and have a limited lifespan – eventually their capacity and performance decline such that they need to bereplaced. Battery aging can contribute to changes in iPhone performance. We created this information for those who would like to learn more.
About lithium-ion batteries
iPhone batteries use lithium-ion technology. Compared with older generations of battery technology, lithium-ion batteries charge faster, last longer and have a higher power density, giving more battery life in a lighter package. Rechargeable lithium-ion technology currently provides the best technology for your device. Find out more about lithium-ion batteries.
How to maximise battery performance
'Battery life' is the amount of time a device runs before it needs to be recharged. 'Battery lifespan' is the amount of time a battery lasts until it needs to be replaced. One factor affecting battery life and lifespan is the mix of things you do with your device. No matter how you use your device, there are ways to help. A battery’s lifespan is related to its 'chemical age', which is more than just the passage of time. It includes different factors, such as the number of charge cycles and how it was cared for. Follow these tips to maximise battery performance and help extend battery lifespan. For example, keep iPhone half-charged when it’s stored for the long term. Also avoid charging or leaving iPhone in hot environments, including direct sun exposure, for extended periods of time.
When batteries chemically age
All rechargeable batteries are consumable components that become less effective as they chemically age.
As lithium-ion batteries chemically age,the amount of charge they can hold diminishes, resultingin shorter amounts of time before a device needs to be recharged. This can be referred to as the battery’s maximum capacity – the measure of battery capacity relative to when it was new. In addition, a battery’s ability todeliver maximum instantaneous performance, or 'peak power', may decrease. In order for a phone to function properly, the electronics must be able to draw upon instantaneous power from the battery. One attribute that affects this instantaneous power delivery is the battery’s impedance. A battery with high impedancemay be unable to provide sufficient powerto the system that needs it. A battery's impedance can increase if a battery has a higher chemical age. A battery’s impedance will temporarily increase at a low state of charge and in a cold temperature environment. When coupled with a higher chemical age, the impedance increase will be more significant. These are characteristics of battery chemistry that are common to all lithium-ion batteries in the industry.
When power is pulled from a battery with a higher level of impedance, the battery’s voltage will drop to a greater degree. Electronic components require a minimum voltage to properly operate. This includes the device’s internal storage, power circuits and the battery itself. The power management system determines the capability of the battery to supply this power, and manages the loads in order to maintain operations. When the operations can no longer be supported with the full capabilities of the power management system, the system will perform a shutdown to preserve these electronic components. While this shutdown is intentional from the device perspective, it may be unexpected by the user.
Preventing unexpected shutdowns
With a low battery state of charge, a higher chemical age or colder temperatures, users are more likely to experience unexpected shutdowns. In extreme cases, shutdowns can occur more frequently, thereby rendering the device unreliable or unusable. For iPhone 6, iPhone 6 Plus, iPhone 6s, iPhone 6s Plus, iPhone SE (1st generation), iPhone 7 and iPhone 7 Plus, iOS dynamically manages performance peaks to prevent the device from shutting down unexpectedly so that the iPhone can still be used. This performance management feature is specific to iPhone and does not apply to any other Apple products. Starting with iOS 12.1, iPhone 8, iPhone 8 Plus and iPhone X include this feature; iPhone XS, iPhone XS Max and iPhone XR include this feature starting with iOS 13.1. Find out about performance management on iPhone 11 and later. The effects of performance management on these newer models may be less noticeable due to their more advanced hardware and software design.
This performance management works by looking at a combination of the device temperature, battery state of charge and battery impedance. Only if these variables require it, iOS will dynamically manage the maximum performance of some system components, such as the CPU and GPU, in order to prevent unexpected shutdowns. As a result, the device workloads will self-balance, allowing a smoother distribution of system tasks, rather than larger, quick spikes of performance all at once. In some cases, a user may not notice any differences in daily device performance. The level of perceived change depends on how much performance management is required for a particular device.
In cases that require more extreme forms of this performance management, the user may notice effects such as:
- Longer app launch times
- Lower frame rates while scrolling
- Backlight dimming (which can be overridden in Control Centre)
- Lower speaker volume by up to -3 dB
- Gradual frame-rate reductions in some apps
- During the most extreme cases, the camera flash will be disabled as visible in the camera UI
- Apps refreshing in the background may require reloading upon launch
Many key areas are not impacted by this performance management feature. Some of these include:
- Mobile call quality and networking throughput performance
- Captured photo and video quality
- GPS performance
- Location accuracy
- Sensors like gyroscope, accelerometer, barometer
- Apple Pay
For a low battery state of charge and colder temperatures,performance management changes are temporary. If a device battery has chemically aged far enough,performance management changes may be longer lasting. This is because all rechargeable batteries are consumables and have a limited lifespan, eventually needing to be replaced. If you are impacted by this and would like to improve your device performance, replacing your device battery can help.
For iOS 11.3 and later
iOS 11.3 and later improve this performance management featureby periodically assessing the level of performance management necessary to avoid unexpected shutdowns.If the battery health is able to support the observed peak power requirements, the amount of performance management will be lowered. If an unexpected shutdown occurs again, then performance management will increase. This assessment is ongoing, allowing more adaptive performance management.
iPhone 8 and lateruse a more advanced hardware and software designthatprovides a more accurate estimation of both power needs and the battery’s power capability to maximise overall system performance.This allows a different performance management system that more precisely allows iOS to anticipate and avoid an unexpected shutdown. As a result, the impacts of performance management may be less noticeable oniPhone 8 and later. Over time, the rechargeable batteries in all iPhone models will diminish in their capacity and peak performance and will eventually need to be replaced.
For iPhone 6 and later, iOS 11.3 and later add new features to show battery health and recommend if you need to replace the battery. You can find these in Settings > Battery > Battery Health (with iOS 16.1 or later, find these in Settings > Battery > Battery Health& Charging).
Additionally, you can see if the performance management feature, which dynamically manages maximum performance to prevent unexpected shutdowns, is on, and you can choose to turn it off. This feature is enabled only after an unexpected shutdown first occurs on a device with a battery that has diminished ability to deliver maximum instantaneous power. Thisfeature applies to iPhone 6, iPhone6 Plus, iPhone 6s, iPhone 6sPlus,iPhone SE (1st generation), iPhone 7 and iPhone 7 Plus.Starting with iOS 12.1, iPhone 8, iPhone 8 Plus and iPhone X include this feature; iPhone XS, iPhone XS Max and iPhone XR include this feature starting with iOS 13.1. Find out about performance management on iPhone 11 and later. The effects ofperformance managementon these newer modelsmay be less noticeable due to their more advanced hardware and software design.
Devices updatingfrom iOS 11.2.6 or earlier will initially have performance management disabled; it will be re-enabled if the device subsequently experiences an unexpected shutdown.
All iPhone models include fundamental performance management to ensure that the battery and overall system operates as designed and internal components are protected. This includes behaviour in hot or cold temperatures, as well as internal voltage management. This type of performance management is required for safety and expected function, and cannot be turned off.
Your battery's maximum capacity
The Battery Healthscreen includes information on maximum battery capacity and peak performance capability.
Maximum battery capacity measures the device battery capacity relative to when it was new. A battery willhave lower capacity as the battery chemically ages which may result in fewer hours of usage between charges.Depending upon the length of time between when the iPhone was made and when it isactivated, your battery capacity may show as slightly less than 100%.
A normal battery is designed to retain up to 80% of its original capacity at 500 complete charge cycles when operating under normal conditions. The one-year warranty includes service cover for a defective battery. If it is out of warranty, Apple offers battery service for a charge.Find out more about charge cycles.
As your battery health degrades, so can its ability to deliver peak performance. The Battery Healthscreen includes a section for Peak Performance Capability where the following messages may appear.
Performance is normal
When the battery condition can support normal peak performance and does not have the performance management features applied,you'll see this message:
Your battery is currently supporting normal peak performance.
Performance management applied
When the performance management features have been applied, you'll see this message:
This iPhone has experienced an unexpected shutdown because the battery was unable to deliver the necessary peak power. Performance management has been applied to help prevent this from happening again.Disable…
Note that if you disable performance management, you can’t turn it back on. It will be turned on again automatically if an unexpected shutdown occurs. The option to disable will also be available.
Battery health unknown
If iOS is unable to determine the device battery health, you'll see this message:
This iPhone is unable to determine battery health. An Apple Authorised Service Provider can service the battery.More about service options…
This may be due to having an improperly installed battery or an unknown battery part.
Performance management turned off
If you disable theapplied performance management feature,you'll see this message:
This iPhone has experienced an unexpected shutdown because the battery was unable to deliver the necessary peak power. You have manually disabled performance management protections.
If the device experiences another unexpected shutdown, the performance management features will be re-applied. The option to disable will also be available.
Battery health degraded
If battery health has degraded significantly, the below message will also appear:
Your battery’s health is significantly degraded. An Apple Authorised Service Provider can replace the battery to restore full performance and capacity. More about service options…
This message does not indicate a safety issue. Your battery can still be used. However, you may be experiencing more noticeable battery and performance issues. A new replacement battery will improve your experience. More about service options.
Important Battery Message
If you see the message below, it means the battery in your iPhone is unable to be verified.This message applies to iPhone XS, iPhone XS Max,iPhone XR and later.
Unable to verify this iPhone has a genuine Apple battery. Health information not available for this battery.Find out more...
Reported battery health information is not available. To have your battery checked, contact an Apple Authorised Service Provider. Find out more about service options.
Find out more about this message as it appears on iPhone 11 and iPhone 11 Pro and later.
Getting further assistance
If your device performance has been affected by an aged battery and you would like to get help with a battery replacement,contact Apple Supportfor service options.
Find out more about battery service and recycling.
Recalibration of battery health reporting on iPhone 11, iPhone 11 Pro and iPhone 11 Pro Max
iOS 14.5 and later includes an update where the battery health reporting system will recalibrate maximum battery capacity and peak performance capability on iPhone 11, iPhone 11 Pro and iPhone 11 Pro Max to address inaccurate estimates of battery health reporting for some users.
Learn more about recalibration of battery health reporting in iOS 14.5.
All rechargeable batteries are consumables and have a limited lifespan — eventually their capacity and performance decline such that they need to be replaced. As batteries age, it can contribute to changes in iPhone performance.Does iPhone battery affect performance? ›
All rechargeable batteries are consumables and have a limited lifespan — eventually their capacity and performance decline such that they need to be replaced. As batteries age, it can contribute to changes in iPhone performance.At what percentage should I replace my iPhone battery? ›
When the capacity of your iPhone battery dips below 80%, you'll see the following message: “Your battery's health is significantly degraded. An Apple Authorized Service Provider can replace the battery to restore full performance and capacity.How do I check my iPhone battery performance? ›
Review your iPhone battery health
Go to Settings > Battery, then tap Battery Health & Charging. iPhone displays information about your battery's capacity, peak performance, and whether your battery needs to be serviced.
Apple considers any iPhone with a battery capacity of 80% or above to be in optimal condition. In fact, Apple feels so strongly about battery health that its 1-year warranty covers any battery at 80% capacity or more. It's not unusual to see iPhones that, after one year, still have a battery capacity of 95% or above.Does replacing iPhone battery increase speed? ›
According to Apple, iPhone batteries are designed to sustain 80% of their capacity even after 500 charging cycles (charging and discharging). However, if you have a slightly older iPhone, replacing the battery would not only improve the battery backup but also improve the performance.Does a weak battery make iPhone slow? ›
For some people, when the battery gets down and hit to 1% or 5%, the iPhone slows down and annoy users like anything.How many years does an iPhone battery last? ›
iPhone battery durability
For most users, this represents approximately two years of use, which is why most people believe that the lifespan of a phone is two years. However when it comes to iPhones, you can expect between three to five years (maybe more) with proper care.
100% is factory-fresh, and iPhones can run extremely well with batteries as low as 80% performance in Maximum Capacity. If your iPhone's battery health has slipped to 75% or below, it will still perform well. However, you can expect further degradation and may see lower numbers and worse performance in the near future.Does Apple replace batteries over 80%? ›
We can replace your iPhone battery for a service fee. Our warranty doesn't cover batteries that wear down from normal use. Your product is eligible for a battery replacement at no additional cost if you have AppleCare+ and your product's battery holds less than 80 per cent of its original capacity.
When should I replace my iPhone battery? Typically, when your iPhone holds less than 80% of its maximum capacity, it's time to upgrade the battery. You can check your battery's health by going to Settings then Battery Health.How do I keep my iPhone battery healthy? ›
- Do not fully charge or fully discharge your device's battery — charge it to around 50 percent. ...
- Power down the device to avoid additional battery use.
- Place your device in a cool, moisture-free environment that's less than 32° C.
- Step 1: Drain the Battery. The first step is to completely drain your iPhone battery. ...
- Step 2: Wait Three Hours. ...
- Step 3: Charge Your Device. ...
- Step 4: Drain Your Device. ...
- Step 5: Wait Another Three Hours. ...
- Step 6: Charge Your Device.
- Make use of 'Power-saving mode' ...
- Restrict app usage on your Android Smartphone. ...
- Turn off 'location services' ...
- Enable 'optimized battery charging' feature. ...
- Use the 'Auto-brightness' feature. ...
- Don't use the iPhone in extreme temperatures. ...
- Use 'Low-power mode' ...
- Reduce 'Auto-lock time' on your iPhone.
Most iPhones last between 4 and 7 years, however this is not guaranteed. If your iPhone is more than a few years old, it's likely starting to become outdated and clunky, and it might be time to think about upgrading to a newer model for a better user experience.What drains iPhone battery fastest? ›
- Display brightness and screen time-out settings. ...
- Background app refresh and background app activity. ...
- Push email and app notifications. ...
- Location services and GPS usage. ...
- Poor cellular signal strength and excessive mobile data usage. ...
- Old and degraded batteries.
Getting your iPhone battery replaced when it starts to slow down should be a no-brainer. In fact, the benefits far outweigh the costs. For starters, you'll want to see if you are still under warranty with Apple. If you're covered, having your battery replaced will be free of charge.Why is iPhone battery degrading so fast? ›
What Makes Your Battery Degrade. Essentially, anything that will run through your iPhone's battery quickly can degrade it, since you'll be using up your charge cycles. Power-hungry apps like those that use Background App Refresh and Location Services are common culprits.Should I leave my iPhone plugged in all the time? ›
As you can see, leaving your iPhone to charge overnight is not a good idea. Not only does it reduce the lifespan of the battery, but it can also cause the battery to overheat. The battery might catch fire leading to bodily injuries. To avoid this, ensure to have a power bank and carry your charger.How fast should iPhone battery health decline? ›
Your battery will chemically deplete over time, and there's no avoiding it. On average, iPhone users can expect to see battery health by about 10% per year depending on the factors discussed above.
Your phone's battery is old
Older batteries cause the operating system to slow the device's performance and processing speed.
Replacing the battery on any iPhone with a Face ID, from the iPhone 13 series, and going back to the iPhone X and XS lines, will cost $89. Going as far back as the iPhone 5S, every phone other than that will cost owners $69 to replace the battery.Should I drain my iPhone battery once a month? ›
Every 1 To 3 Months
“It's not a good idea to drain your iPhone battery down to zero too often, but doing it from time to time does actually be beneficial because it allows your battery to stretch its legs and run a full charge cycle,” Cheng says.
Another major advantage that iPhones have over Samsung phones is the longevity of the devices. Although Samsung now offers four years of major Android updates for its flagships and mid-range phones, iPhones can easily last for five to six years. However, there's one important caveat to this.At what health percentage should I replace my battery? ›
While a slightly lower percentage is lower as your phone ages, it should still retain about 80% of the capacity at 300-500 charge cycles. If it starts dropping below 80%, it's time for a battery replacement.Can I change my iPhone battery? ›
Yes. If you're reluctant to take your iPhone into an Apple Store or send it off via Apple's mail-in service, you can also replace the battery yourself via Apple's self repair program.Is it worth replacing phone battery? ›
Replacing your battery is a great way to lengthen the life of an older model phone. Cell phone batteries only last about two years before they begin to degrade. After that, they're prone to charging issues. An old battery can also slow down the performance of your phone or even lead to sudden shutdowns.Should I buy iPhone with 82 battery life? ›
Apple considers any iPhone with a battery capacity of 80% or above to be in optimal condition. In fact, Apple feels so strongly about battery health that its 1-year warranty covers any battery at 80% capacity or more.What if my iPhone battery is at 81% health? ›
If your battery health shows 81%, then it is soon time to change the battery. The battery needs to be replaced at the Apple Store or authorized Apple Service shop when the phone is down to 80% Battery Health / Maximum Capacity.How much does iPhone 13 battery cost? ›
iPhone 13 Battery price is 5280 Rs with 6 Months Warranty our technician will replace it at your doorstep.
How much is Apple iPhone 12 Battery Replacement repair and replacement cost in India? Apple iPhone 12 Battery Replacement cost is Rs. 4999 with 6 months warranty.Does fast charging reduce battery life? ›
While fast charging can increase the rate at which your battery loses capacity, its actual impact is only about 0.1 percent more capacity lost than without using fast charging.What is the price of iPhone 11 battery? ›
How much is Apple iPhone 11 Battery Replacement and repair cost in India? Apple iPhone 11 Battery Replacement cost is Rs. 2499 with 6 months warranty.At what percentage should I charge my phone? ›
When should I charge my phone? The golden rule is to keep your battery topped up somewhere between 30% and 90% most of the time. Top it up when it drops below 50%, but unplug it before it hits 100%. For this reason, you might want to reconsider leaving it plugged in overnight.Should I charge my iPhone to 100? ›
Apple recommends, as do many others, that you try to keep an iPhone battery between 30 and 80 percent charged. Topping up to 100 percent isn't optimal, although it won't necessarily damage your battery, but letting it regularly run down to 0 percent can prematurely lead to a battery's demise.How do you recalibrate a battery? ›
- Discharge your phone fully until it turns itself off.
- Turn it on again and let it turn itself off.
- Plug your phone into a charger and, without turning it on, let it charge until the on-screen or LED indicator says 100 percent.
- Unplug your charger.
- Turn your phone on.
When batteries chemically age. All rechargeable batteries are consumable components that become less effective as they chemically age. As lithium-ion batteries chemically age, the amount of charge they can hold diminishes, resulting in shorter amounts of time before a device needs to be recharged.How long does it take for iPhone battery health to drop to 99? ›
So what is your question. There is nothing wrong with it showing 99% after two months. Batteries are consumable, so as you use them, battery health will decline, based on the number of full charge cycles. Apple does not consider a battery problem unless the battery health gets to 80% before the end of one year.Why is my iPhone battery not going to 100? ›
As mentioned earlier, the battery's temperature can affect it, so your iPhone or iPad may not be able to charge to 100% and is stuck at around the 80% threshold. To fix this, you should try moving your iPhone or iPad to a cooler location, which would be more conducive.Is 97 battery health good after 8 months? ›
That is a great score for an 8 month old phone. Apple recommends replacing the battery when it reaches 80%.
- Battery Dies Quickly. All smartphone batteries die over time. ...
- Screen Isn't Working. ...
- Mic Isn't Working. ...
- Phone Moves Slowly. ...
- Buttons Stop Working. ...
- Apps Crash or Stop Working Altogether. ...
- Phone Heats up Rapidly. ...
- Phone Is Damaged.
The iPhone 15 models will likely be released in September 2023 if Apple follows its traditional September launch timeline.Do you really need a new iPhone every year? ›
Your iPhone Probably Looks the Same
And since Apple introduces newer models every year, there is hardly any major physical change in the shape and design of an iPhone. It might make sense to buy a new iPhone if you have a three or four-year-old model, but you won't see any significant changes if it's just a year old.
Internal components: A weak battery affects performance by causing damage to the engine's internal parts. The low voltage causes the temperature to go up, and overheating can result, which causes damage to the engine parts.Does bad battery health affect phone performance? ›
A normal battery is designed to retain up to 80% of its original capacity at 500 complete charge cycles when operating under normal conditions. Performance Capability - As your battery health degrades, its ability to deliver peak performance will fade over time.When should I replace my iPhone battery? ›
When should I replace my iPhone battery? Typically, when your iPhone holds less than 80% of its maximum capacity, it's time to upgrade the battery. You can check your battery's health by going to Settings then Battery Health.Can a weak battery cause problems? ›
Can a Bad Battery Cause Electrical Problems? Yes, if your battery is underperforming it can cause systems within the vehicle to malfunction. A bad battery can also result in air conditioners, stereos and other applications not receiving enough power to function properly.Can a new battery improve performance? ›
Replacing an old car battery with a new one completely resets the EMS system of the car. It goes back to its original factory configuration that your car came with. The Engine Management System (EMS) is mainly responsible for the smooth functioning of your car. It leads to a great performance that your car came with.Can a bad battery cause slow acceleration? ›
Can a low car battery affect acceleration? No. The battery is just to start the engine. Once running, the alternator produces all the electricity the engine needs acceleration is provided by the fuel fed into the engine.Is it better to buy a new phone or replace battery? ›
Replacing your battery is a great way to lengthen the life of an older model phone. Cell phone batteries only last about two years before they begin to degrade. After that, they're prone to charging issues. An old battery can also slow down the performance of your phone or even lead to sudden shutdowns.
Moreover, keeping the device at full charge or completely drained can negatively impact your iPhone's battery health. For this reason, you should try to keep your device between 40% and 80% battery as much as possible to preserve your iPhone's battery health.At what percentage of battery health should I replace my phone? ›
“Maximum Capacity” shows you how well your battery is performing compared to when it was brand new. While a slightly lower percentage is lower as your phone ages, it should still retain about 80% of the capacity at 300-500 charge cycles. If it starts dropping below 80%, it's time for a battery replacement.Can I run a diagnostic test on my iPhone? ›
Phone Diagnostics for iPhone and Android
Available for iPhone(Opens in a new window) and Android(Opens in a new window), Phone Diagnostics offers a range of tests to check your touch screen, camera, speaker, microphone, Wi-Fi, cellular access, and many other components.
Yes. If you're reluctant to take your iPhone into an Apple Store or send it off via Apple's mail-in service, you can also replace the battery yourself via Apple's self repair program. Launched in mid-2022, the program allows you to order spare parts, tools and how-to manuals you need from Apple.How much does it cost to replace a battery in an iPhone 11? ›
|Battery Replacement Cost (Swappa Repair Network)||Battery Replacement Cost (Apple out-of-warranty)|
|iPhone 11 Pro||$105||$69|
|iPhone 11 Pro Max||$98||$69|