Applewatch is closed in cold weather.

1. Because Apple's built-in power supply uses a lithium battery, and the lithium battery of iphone has self-protection, which is called low-temperature protection. It means that when the temperature is too low, lithium metal in the battery will precipitate and no longer react chemically with substances, thus causing short circuit inside the battery.

2. So in the cold winter and cold environment, the user's iphone will automatically turn off.

1. In fact, after knowing the reason why the iphone automatically shuts down in winter, our solution is very simple. We need to make our iphone "hot".

2. Because the optimal temperature for charging the lithium battery of iphone is above 10℃, it is best to start charging in a warm room in winter, otherwise the battery will be easily damaged. Therefore, if users find that the iphone shuts down automatically, they can first transfer the device to a warm room for charging, that is, heat the iphone slightly before charging (or blow the back of the machine with a hair dryer for heating).