I've been using Nest thermostat for the last 3 months with no problems, last night I noticed it is not connected to wifi due to low battery, so I charged the nest with a USB cable for 2 hours and plugged it in again, all was fine until this morning, it was offline again, I tried to find why, and it keeps restarting and says "back in a bit" with blinking red light. Is there a way to replace it? I assume it's still under warranty?
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It was receiving a "trickle charge" slightly below what it actually used daily, so the battery was able to power it for those 3 months with no issue. 2 hours to charge it via usb only topped off the battery enough for the overnight load I suspect, so your back to square one. My suggestion is to charge it again via USB, and once it's back online, log into the app and go into settings to check the voltage( settings, technical info, battery). It should stay firm at 3.89 if receiving proper voltage and is fully charged. If it starts dropping, that's the answer.
If it's able to take a charge via USB I suspect the battery itself is okay, and it's just not getting enough juice while on the wall.
One possible solution is to get a C wire adaptor to install , however I personally have no experience with that. There are many articles online that you can google for more information about this option.
My apologies for the late response. I wanted to reach out and see if you are still in need of any help? Please let me know, as I would be more than happy to look into any questions you may have.