iPhone 6, 6S, SE and 7 run much slower when the battery is old and cannot provide enough power for the processor. In fact, Apple has talked about this issue when it came out iOS 10.2.1 a year ago, that the device was slow to fix the error that caused the iPhone 6 to crash due to insufficient power for the processor. But they did not elaborate on how much machine speed would have to be sacrificed and the recent measurement results showed that the machine was much slower.
Apple did not say that it deliberately slowed down the machine, but just tried to maximize the iPhone battery life 'to avoid unexpected collapse.' According to them, power management uses a combination of machine temperature, battery status and battery impedance. Only when these variables are required, the new iOS tries to optimize the operation of some other factors such as the CPU or GPU to avoid the machine from collapsing.
Microprocessors are only part of the battery-speed machine relationship. According to Apple, when the iPhone battery is slow, the screen will be darker, the speaker volume is smaller and even the camera's flash will be turned off. Important features such as cellular, GPS or camera quality are not affected. How to handle even smart but can not replace the speed of using the machine.
Either way, Apple has a long way to regain customer trust.
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