The iPhone is designed to provide a simple and easy-to-use experience. This was only possible through a combination of advanced technologies and precision engineering. Among these important technologies are battery and performance. Batteries represent one of the complex technologies, and there are many variables that contribute to the performance of the battery and its relationship to the performance of the iPhone.
All rechargeable batteries are consumables and have a limited life - ultimately their capacity and performance decline, so they will need to be replaced. And when a long time passes on the battery, this may lead to changes in the performance of the iPhone.
About lithium-ion batteries
IPhone batteries use lithium-ion technology. Compared with older generations of battery technology, Li-ion batteries charge faster, last longer, and have a higher energy density for longer battery life and lighter weight. The rechargeable lithium-ion technology currently offers the best technology for your device.
How to get the best battery performance
Battery Charge Time
The amount of time a device lasts before it needs to be recharged.
Battery Life
The amount of time the battery lasts before it needs to be replaced.
One of the factors affecting battery life and battery life is a combination of the things you do on your device. No matter how you use the battery, there are several ways to help. Battery life is related to “chemical age,” which is more than just the passage of time. This includes various factors, such as how often it charges and how it is taken care of.
For example…
It is best to keep the iPhone half-charged when it is stored for the long term.
Also, avoid charging the iPhone or leaving it in a hot environment.
Avoid direct exposure of the iPhone to the sun for long periods of time.
When the chemical life of the battery increases
All rechargeable batteries are consumable components that become less reliable with age and increase their chemical life.
Because lithium-ion batteries age over time, their capacity for charging decreases over time as well, resulting in less time before the device is recharged. This can be referred to as the battery’s maximum capacity, meaning calculating the battery’s capacity compared to its capacity when it was new. Moreover, the battery’s ability to provide instantaneous peak performance, or what is known as "peak power", may be reduced.
In order for the phone to function properly, electronic components must be able to draw instant power from the battery. One of the features that affects the instantaneous power draw is the battery resistance. The battery with high resistance is not able to provide the sufficient power needed by the system.
Battery resistance may increase if the battery has a higher chemical age. The battery resistance will temporarily increase if the charge is low and when it is in a cold temperature environment. When combined with a higher chemical age, the increase in resistance is greater. These battery chemical properties are common to all technology-based lithium-ion batteries.
When the power is drawn from a battery with a higher resistance level, the battery voltage is very low. Electronic components require a minimum voltage to operate properly. This includes the device's internal storage, power circuits, and the battery itself. The energy management system determines the capacity of the battery to supply this energy and manage loads in order to maintain operations.
When the power management system cannot support operations even with full capabilities, the system will perform a shutdown to maintain these electronic components. This shutdown might be unexpected by the user, but it happened on purpose from a hardware perspective.
Avoid sudden stops
With a battery condition of low charge, increased chemical life, or in cooler temperatures, the user will be more likely to have a sudden stop. In extreme cases, shutdowns can occur frequently, rendering the device unreliable or unusable. On some iPhone models, the iOS system dynamically manages peak performance levels to prevent the device from suddenly stopping until the iPhone continues to be used. This performance management feature is a feature of iPhone and does not apply to any of the other Apple products.
This performance management reviews a combination of device temperature, battery charge status, and battery resistance. If only these variables require it, iOS will dynamically manage maximum performance for some system components, such as the CPU and GPU, in order to prevent a sudden stop. As a result, device workloads will be self-balancing, allowing system tasks to be distributed more smoothly, instead of simultaneously large and rapid fluctuations of performance. In some cases, the user may not notice any differences in the daily performance of the device. The level of change noticeable depends on the amount of performance management required for a particular device.
In situations where performance management requires more complex models, the user may notice effects such as:
◉ Longer application time to run
Low frame rates while scrolling
Backlight dimming (which can be overridden in Control Center)
The speaker volume is reduced by -3 dB
Gradual decrease in frame rate in some applications
◉Disable the camera flash during the most complex situations, as shown in the camera user interface
Background App Renewal may require reloading upon application launch
Several key areas are not affected by this performance management feature. Some of these areas include:
Cellular call quality and throughput network performance
◉ Captured images and video quality
GPS performance
Location Accuracy
Sensors such as gyroscope, accelerometer and barometer
Apple Pay
In the case of a low battery charge and cooler temperatures, performance management changes are temporary. If the chemical life of the device battery is nearing expiration, this may increase performance management changes. This is because all rechargeable batteries are expendable and have a limited life and will eventually need replacement. If you've been affected by this and want to improve your device's performance, replacing your device's battery helps.
For iOS 11.3
IOS 11.3 improves this performance management feature by periodically evaluating the level of performance management needed to avoid a sudden stop. If the battery efficiency can meet the requirements of the required peak power levels, then the performance management level will be reduced. And if a sudden stop occurs again, the performance management will be increased. This evaluation is done on an ongoing basis, providing performance management that is more adapted to each case.
IPhone 8, iPhone 8 Plus, and iPhone X models use more advanced hardware components and design advanced software to provide a more accurate estimate of battery power requirements and battery capacity, with the goal of getting the most out of overall system performance. This provides a different performance management system that allows iOS to predict sudden stops more accurately, and thus prevent them from occurring. As a result, the effects of performance management may be less noticeable on these newer models. Over time, however, the rechargeable batteries capacity on all iPhone models will diminish, peak-time performance will decrease and will eventually have to be replaced.
Battery health setting (experimental)
On iPhone 6 and later, iOS 11.3 adds features to display battery efficiency and recommend battery replacement when necessary. These features can be found in “Settings”> “Battery”> Battery Health (Demo).
Moreover, users can see if the performance management feature that dynamically manages the maximum level of performance to prevent sudden stops is working or not. This feature is only enabled after the device's first sudden stop in a battery that has diminished its ability to provide instant maximum power. This feature is available on iPhone 6, iPhone 6 Plus, iPhone 6s, iPhone 6s Plus, iPhone SE, iPhone 7 and iPhone 7 Plus.
Note: Performance management is disabled initially on devices that update to iOS 11.3, and then restarts if the device later encounters an unexpected shutdown.
All iPhone models include basic performance management to ensure perfect battery and system operation while providing protection for internal components. This includes behavior of the device during high and low temperatures, as well as internal voltage management. This type of performance management is required for safe and optimal performance, and it should not be stopped.
Maximum battery capacity
The Battery Efficiency screen contains information about maximum battery capacity and peak performance potential.
The maximum battery capacity measures the device's battery capacity compared to its capacity when it was new. When the batteries are first activated, their capacity is 100%, then the capacity decreases as the battery chemically ages, which may lead to a decrease in the number of hours of use between charges.
The normal battery is designed to retain up to 80% of its original capacity over 500 full charge cycles under normal operation. The one-year warranty includes service coverage for a defective battery. If the device is out of warranty, Apple will provide battery service for a fee.
As the battery efficiency decreases, its ability to deliver peak time performance decreases. The “Battery Efficiency” screen displays a section for “Peak performance capability” where the following messages appear.
Performance is normal
When the battery can provide peak performance, and the performance management features are not applied, the following message will appear:
Your battery currently supports its normal peak performance.
Performance management application
When the performance management features have been applied, the following message will appear:
This iPhone has had an unexpected shutdown because the battery was unable to provide the necessary peak power. Performance management has been implemented to help prevent this from happening again. Disable ...
It's worth noting that when you disable performance management, you won't be able to turn it on again. Rather, it turns on again automatically when an unexpected shutdown occurs. The option to disable also appears.
Battery efficiency is unknown
If iOS is unable to determine a device's battery efficiency, the following message will appear:
This iPhone cannot determine battery efficiency. You can obtain service for the battery at an Apple Authorized Service Provider. More about service options ...
This may be due to improper battery installation or an unknown battery piece.
Performance management has been stopped
When the applied performance management feature is turned off, the following message will appear:
This iPhone has had an unexpected shutdown because the battery was unable to provide the necessary peak power. I manually disabled the performance management protection measures.
If the device experiences another unexpected shutdown, performance management features will be applied. The option to disable also appears.
Battery efficiency has decreased
If the battery efficiency decreases significantly, the following message will appear:
Your battery efficiency is extremely low. You can get an Apple Authorized Service Provider to replace the battery and restore full performance and capacity. More about service options ...
This message does not indicate a security problem. You will still be able to use the battery. But you might experience bigger battery and performance issues. The battery can be replaced to improve your experience.
Get help to change the battery
If your device's performance is affected by an aging battery, and you need help replacing the battery, contact Apple Support for service options.
You can read this article to learn more about how to contact Apple
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