Nest Learning Thermostat Gen 3 WiFi Connection Lost Low Battery Issue

[CJD88]

Nest Learning Thermostat Gen 3 recently having repeat Low Battery issues, leading to loss of WIFI connection and losing connection in the Nest App as a result of not being able to connect to WIFI.

Battery: 3.743V, Voc: 40.43V, Vin: 38.85V, lin: 40mA

Battery: 3.738V, Voc, 40.43V, Vin 7.6V, lin: 20mA (while central air is running)

Wired: Y1, W1, G, Rc, Rh

The first time this happened (2 days ago) I restarted the thermostat and everything functioned normally. Today restarting the thermostat is not helping the situation. I didn't bother charging using a charging cable since the battery has a full charge. Weather has been hot and humid for days so not sure if that is contributing to the problem. I have had this thermostat for around 3 years and I never had any issues. If this is just a case of the battery going bad is a replacement battery an option or does the whole device need to be replaced? For the cost there should be some options besides replacing the whole unit.

[Greenehouse]

I have 2 in my home both just started this at the same time. 

[CoolingWizard]

@CJD88 , are there any wires in the thermostat cable not connected to any terminals of your thermostat?

AC Cooling Wizard

[CJD88]

@CoolingWizard no all wires are connected

[AxelD]

Hi @CJD88,

Thanks for posting in the community! Sorry to hear that your Nest Learning Thermostat is getting a low battery message. Checking the power readouts you provided, everything seems fine. No worries, help is here! Let's try some troubleshooting steps:

1. Charge the thermostat via a micro-USB cable for at least 1 hour.
2. Perform a Factory reset.

Let me know how it goes.

Regards,

Axel. 

[CJD88]

Hi Axel

Fortunately I have not had to take these actions. The past 5 days I have not had any issues. If the problem occurs again I will try this and see if it works.

Thanks