Google confirms the Nest Cam and Doorbell won't charge in freezing weather
Sunday, February 20, 2022 at 10:19PM 
Source: Google
Don't subject the battery-equipped Nest Doorbell and Cam to extreme cold weather. Google recently published a support document saying the lithium-ion battery in the Google Nest Doorbell and Cam won't charge at "temperatures below freezing." The company said the battery versions of this device can work at temperatures as low as minus four degrees Fahrenheit/minus 20 degrees Celsius, but the batteries must have a charge in them. Google also warns that the batteries might drain faster in cold weather, potentially halved when the devices are near their operating limit.
Google recommends you bring in the Nest Doorbell and Cam indoors in these situations. The warmer the battery gets, the faster it will charge. The Home app can let you know when to bring in the device. It'll display a notice that says "Charging paused" or "Charging slowly," with a lengthy estimated charging time. You should bring it in when you see that.