Learning Thermostat still getting Low Battery after power restored

[Tigger_76]

I have a Nest Learning Thermostat:

Model Display: 3.4
Software version: 6.2-27
Base Software version: 1.5.38 / 3.1
Model Backplate: 5.3

After being out of the house yesterday, I came home and there was a message that the Nest had lost power, and shortly later the display went off completely.  After checking breakers and such, we had a heat and A/C tech out, who replaced the transformer in the furnace this morning.  The Nest is showing that it has power now, but after a couple of hours of having power I'm still getting a Low Battery alert and the thermostat will not connect to WiFi.

The connections shown and power are:

W1-Y1-G-Rh
Battery: 3.706 V
Voc: 38.13 V
Vin: 36.67 V
Lin: 20mA (i)

Do I just need to wait longer, or is there a problem with my thermostat and I either need to replace the battery, or the whole thermostat?

Thanks for any help you can offer.

[Tigger_76 · Accepted solution]

Patience was a virtue this time.  After about 8 hours, the low battery alert cleared and everything is back to normal.

[Markjosephp]

Hello Tigger_76,

Thanks for posting and for keeping us in the loop. I'm glad to hear that your Nest Thermostat is up and running again. In case the same thing happened, here's an article with some troubleshooting steps when your thermostat won't turn on.

Please let us know if you have any additional questions or concerns before we close this thread in 24 hours.

Regards,
Mark