We've had a Google Nest Camera (Battery) since Sept. 2021, plugged in all the time with the optional power cable, and it has stayed charged at temperatures as low is -20 degrees Fahrenheit in a Minnesota winter. However, if you intend to run it on battery power, you should know that the battery cannot charge at temperatures below freezing. After numerous posts in this forum and elsewhere, Google Nest finally conceded this by adding this help page several months ago: https://support.google.com/googlenest/answer/11830989?hl=en
I apologize for my late response and thank you for all of your patience while waiting for a reply. I understand how frustrating your situation must be, and I would love to help however I can. I would suggest that you look over this article which will explain best practices, and provide some important information that you may find helpful if you are thinking of getting one of our battery devices in the colder months.
I appreciate the help, Brad. Just checking in to make sure that you've seen our responses. Please let me know if you have other questions or concerns as I will be locking this in 24 hours if I won't hear back from you again. Feel free to start a new thread and we'll be happy to help.