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Why does iPhone turn off frequently at low temperatures? What should I do if my iPhone cannot be charged in cold weather?

Why does iPhone turn off frequently at low temperatures? What should I do if my iPhone cannot be charged in cold weather?

Oct 9,2021
Lithium batteries are now the mainstream choice for most mobile phones. Compared with traditional nickel-chromium batteries, they charge faster and last longer. This is due to the strong activity of lithium ions in lithium batteries. The so-called "activity" is generally speaking the feasibility of its chemical reaction. Temperature is the most common and one of the most important factors for chemical reactions.

In general, the battery used in the iPhone maintains a high-intensity activity through lithium ions, and there is a potential difference to generate current. However, as the ambient temperature decreases, the lithium ion activity will decrease, and the current will also decrease. At this time, the iPhone Reaper's detection mechanism will activate the battery protection function, which is prone to frequent shutdowns.

The aging and degradation of lithium batteries is not only reflected in the capacity, but also in the peak output level. However, most users only pay attention to the capacity degradation and ignore the power. Due to Apple's extreme pursuit of a thin and light body, under this idea, the battery volume is greatly restricted. Apple’s A-series processors are known for their performance, but they are limited by the battery and heat dissipation of the mobile phone, making it difficult to achieve the performance of their applications. They can only switch to a radical turbo strategy. In a few seconds or even a few tenths of a second, the output is much higher than the average power of the battery, and then the average power is slowed down during low-intensity use.

However, as the use time of the equipment increases, the problems of battery capacity and its limited design are more likely to be highlighted: when the battery ages or the temperature drops, the internal resistance will increase, and the peak state will cause a greater instantaneous pressure drop, causing some equipment to remain If there is a part of the remaining power, it will directly start low-voltage shutdown. This problem is concentrated on the iPhone 6 and iPhone 6s two generation models with small battery capacity and relatively poor battery quality. However, the design ideas and appearance of subsequent mobile phones have not changed much. In addition to the negative impact of iOS 11, even if the turbo frequency algorithm is optimized, the battery supplier is changed, or even the chip is reduced, the problem of frequent shutdowns in low temperature environments has not been solved.

In addition to being easily affected during discharge, lithium batteries are also affected when they are charged in a low temperature environment. It is difficult to charge iPhone X in a low temperature environment. Try to stay away from extreme temperatures when using your phone. Apple's official website gives the temperature range of the device, please pay attention to it when using iPhone.