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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. This performance management works by looking at a combination of the device temperature, battery state of charge and battery impedance.
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The effects of performance management on these newer models may be less noticeable due to their more advanced hardware and software design. Find out about performance management on iPhone 11 and later.
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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. This performance management feature is specific to iPhone and does not apply to any other Apple products. 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. In extreme cases, shutdowns can occur more frequently, thereby rendering the device unreliable or unusable. With a low battery state of charge, a higher chemical age or colder temperatures, users are more likely to experience unexpected shutdowns. While this shutdown is intentional from the device perspective, it may be unexpected by the user.
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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. The power management system determines the capability of the battery to supply this power, and manages the loads in order to maintain operations. This includes the device’s internal storage, power circuits and the battery itself. Electronic components require a minimum voltage to properly operate. When power is pulled from a battery with a higher level of impedance, the battery’s voltage will drop to a greater degree. These are characteristics of battery chemistry that are common to all lithium-ion batteries in the industry. When coupled with a higher chemical age, the impedance increase will be more significant. A battery’s impedance will temporarily increase at a low state of charge and in a cold temperature environment. A battery's impedance can increase if a battery has a higher chemical age. A battery with high impedance may be unable to provide sufficient power to the system that needs it.
One attribute that affects this instantaneous power delivery is the battery’s impedance. In order for a phone to function properly, the electronics must be able to draw upon instantaneous power from the battery. In addition, a battery’s ability to deliver maximum instantaneous performance, or 'peak power', may decrease. This can be referred to as the battery’s maximum capacity – the measure of battery capacity relative to when it was new. All rechargeable batteries are consumable components that become less effective as they chemically age.Īs 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.
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