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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 so that they need to be replaced. Battery ageing 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 it, 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, resulting in 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 to deliver 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 impedance may be unable to provide sufficient power to 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. 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 feature by 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 later use a more advanced hardware and software design that provides 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 on iPhone 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.
Battery Health
For iPhone 6 and later, iOS 11.3 and later add new features to show battery health and recommend if a battery needs to be replaced. These can be found in Settings > Battery > Battery Health.
Additionally, users can see if the performance management feature that dynamically manages maximum performance to prevent unexpected shutdowns is on and 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. This feature applies to iPhone 6, iPhone 6 Plus, iPhone 6s, iPhone 6s Plus, 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. The effects of performance management on these newer models may be less noticeable due to their more advanced hardware and software design.
(Note: Devices updating from 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 Health screen 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 will have 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 is activated, 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 Health screen 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…
Yate tag and organize your audio files 5 0. This may be due to having an improperly installed battery or an unknown battery part.
Performance management turned off
If you disable the applied 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. Art studio pro 2 3 16 inch.
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.
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.Learn 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.
Getting further assistance
If your device performance has been impacted by an aged battery and you would like to get help with a battery replacement, contact Apple Support for service options.
Find out more about battery service and recycling.
iOS 14 with a pack of cool new features is coming soon. It's believed that it will solve the battery and performance issues. This enticed a wide move that led to many upgrading to this iOS 14. However, it’s not all good news as reports have indicated iPad and iPhone batteries draining too fast after the iOS 14 update.
- Part 1: iOS 14 New Feature: Battery Health & Performance
- Part 2: Solutions to iPhone Battery Drain Even After iOS 14 Update
iOS 14 New Feature: Battery Health & Performance
As Apple promised, the iOS 14 adds new features to show you the battery health. You can manage your performance according the the specific battery status of your iPhone and iPad. If your battery needs to be serviced, you will also receive the recommendation.
Please note, the battery health is available for iPhone 6 and later. You can find it in 'Settings > Battery > Battery Health (Beta)'.
By default when you update to iOS 14, the performance management feature that dynamically manages maximum performance to prevent unexpected shutdowns is off. But it will be automatically on if your iPhone subsequently experiences and unexpected shutdown.
The Battery Health screen includes informations about maximum battery capacity and peak performance capability.
Maximum Capability:
Maximum capability measures the battery capacity relative to when it was new. It will start at 100% and will have lower capacity as battery chenically ages. A normal battery is designed to remain up to 80% of the original capability. You will get the notification if your battery should be replaced.
Peak Performance Capability:
The iOS 14 will show you one of the 5 messages under 'Peak Performance Capability':
1. Performance is normal
It means, your battery condition is able to support normal peak performance and doesn't have the performance management features applied.
2. Performance management applied
It means the performance management features have been applied.
3. Battery health unknown
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Due to having an improperly installed battery or an unknown battery part, your iPhone can't determine the device battery health.
4. Performance management turned off
You will see this message when you disable the applied performance management feature. But note that, this feature will be turned on when your device experiences another unexpected shutdown.
5. Battery health degraded
It means, your battery health has degraded seriously. But it doesn't indicate a safety issue. The battery can still be used.
Solutions to iPhone Battery Drain Even After iOS 14 Update
If you are one of the people experiencing a faster battery drain in your older iPhone or iPad model even after updating to iOS 14, there are a few things you can do to extend your battery life potentially. Some of them include;
1. Disable Background App Refresh Mode on your iPad or iPhone
When this mode is on, the inactive apps are updated in the background leading to a negative impact on the battery life. Disabling Background App Refresh helps reduce the iPhone battery dries too fast problem after upgrading to iOS 14.
To deactivate this mode, go to Settings > General > Background App Refresh > toggle OFF.
2. Turn Down Brightness of the Screen
Maximum screen brightness requires a lot of energy, and this leads to draining of your battery life at a faster rate even after an upgrade to iOS 14.
Screen brightness can be reduced in Settings > Display & Brightness > Brightness > adjust the slider to a lower position
3. Disable Location Services and Raise to Wake Mode
Some services when on, such as the GPS or the Raise to Wake Mode, significantly reduce the battery life even when your iPhone or iPad is not in use. Unnecessary apps use the GPS Services when on in iOS 14. On the other hand, Rise to Wake Mode when on keeps waking the screen when the phone detects slight movement, for instance, when one is walking or jogging.
To limit apps using the Location services go to Settings > Privacy > Location Services
To limit apps using the Location services go to Settings > Privacy > Location Services
To turn off Rise to wake mode go to Settings > Display & Brightness > Raise to Wake > toggle OFF
4. Turn on the Low Power Mode
The low power mode helps save on energy and prolong the battery life by turning off some of the unnecessary features and disables background activity. This mode can assist in resolving the faster drying of battery after the iOS 14 upgrade.
To activate this mode, go to Settings > Battery > Low Power Mode > Toggle to ON
5. Wait for a Few Days to See If the Situation Improves
After an upgrade to a new iOS, the device, and the upgraded iOS has the task of re-categorizing and re-indexing files for a smoother and optimized running which occurs in the background or when your device is idle. These background processes cause your battery to dry up faster than usual. The solution to this is to give your device a few days for things to get back to normal after the re-categorizing and re-indexing of files and data is done
6. Clear Junk/Corrupted Files to Take the Most Advantage of iOS 14
In some situations, you might try all the solutions above and still, and your battery still drains up. You can try simply clean all the junk files and corrupted files, which will stop useless data draining battery from the background and stop your iPhone from unexpected shutdown.
There is no efficient way to manually clear your iPhone, but you can taka advantage of iMyFone Umate Pro which is an all-in-one iPhone cleaner. It’s a third-party application designed and developed by iMyFone as a one-stop solution to iOS issues. It tackles most issues including cleaning up all your iOS junk and temporary files thus improving iPhone performance to optimal speeds which solve the battery draining too fast problem. Other Umate Pro features include
iMyFone Umate Pro iPhone Eraser
Key Features:
- 1-click cleanup mode allowing you to clean up hidden garbage and files that are still lurking on your iPhone or iPad making it run slower.
- Ability to preview and selectively erase files that you want to get rid of
- Erase Third-Party Apps private fragments completely and in-depth making your device faster and at the same time improving your privacy
- Erases iPhone data and makes it 100% unrecoverable even by other recovery tools
- Fully compatible with iOS 14 and receive lots of positive reviews from macworld.co.uk, Makeuseof.com , Cultofmac.com etc.
iMyFone Umate Pro Using Steps
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- Step 1. Download Umate Pro on your PC and launch it
- Step 2. Connect your iPad or iPhone to your PC using a USB cable and wait till Umate Pro App detects it
- Step 3. Choose “1-Click Free Up Space” mode and then click on 'Quick Scan' for a full space saving analysis
Step 4. After the scanning process finishes, click on clean button to clean up space by erasing junk and temporary files, compress photos, delete large files and remove apps draining your power
Step 5. Once done your device performance and speed increases solving the increased power draining problem after iOS 14 upgrade