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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. IPhone performance management works by looking at a combination of the device temperature, battery state of charge, and battery impedance. Learn about performance management on iPhone 11 and later. 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 doesn't 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 unexpectedly shutting down, so you can still use your iPhone. In extreme cases, shutdowns can occur more frequently, making the device unreliable or unusable. You're more likely to experience unexpected shutdowns when your battery has a low state of charge, a higher chemical age, or when you're in colder temperatures. While this shutdown is intentional from the device perspective, it might be unexpected by the user. 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 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.
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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 a high impedance might 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. 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,” might decrease. This can be referred to as the battery’s maximum capacity - the measure of battery capacity relative to when it was new. When batteries chemically ageĪll 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. Also avoid charging or leaving iPhone in hot environments, including direct sun exposure, for extended periods of time. For example, keep iPhone half charged when it’s stored for the long term. Follow these tips to maximize battery performance and help extend battery lifespan. It includes different factors, such as the number of charge cycles and how it was cared for. A battery’s lifespan is related to its “chemical age,” which is more than just the passage of time. No matter how you use your device, there are ways to help. One factor affecting battery life and lifespan is the mix of things you do with your device. “Battery lifespan” is the amount of time a battery lasts until it needs to be replaced. “Battery life” is the amount of time a device runs before it needs to be recharged. Rechargeable lithium-ion technology currently provides the best technology for your device. Compared with older generations of battery technology, lithium-ion batteries charge faster, last longer, and have a higher power density for more battery life in a lighter package. IPhone batteries use lithium-ion technology. Learn more about iPhone batteries and how battery aging can affect iPhone performance. All rechargeable batteries are consumables and have a limited lifespan - eventually their capacity and performance decline such that they need to be replaced. Batteries are a complex technology, and a number of variables contribute to battery performance and related iPhone performance. One important technology area is battery and performance. This is only possible through a combination of advanced technologies and sophisticated engineering. Your iPhone is designed to be simple and easy to use. Understand iPhone performance and its relation to your battery.