Why does the Bluetooth headset automatically turn off when it is cold?

The battery capacity is not very good at low temperature. With the cold weather in many cities in the north, many users who use Apple AirPods headphones find that their headphones are used for a shorter time than usual. Obviously, the weather around 0 degrees has greatly reduced the battery capacity of AirPods. AirPods is used outdoors for less than two hours in winter, which is related to the battery capacity attenuation at low temperature, which is not very good. Because all electronic products use lithium batteries, the chemical reaction activity will be reduced at low temperature, and the lithium ion migration will be slow, and the charging and discharging ability of the battery will be obviously reduced.