Nest thermostat says it has a low battery and won't connect to wifi anymore. Checked the technical info and from what I've read, all numerical values check out that it should be
No C-wire? Install a Nest thermostat at your own risk – Smart Thermostat Guide
Google Nest Learning Smart Thermostat (3rd Generation) with WiFi Compatibility in Stainless Steel and Nest Temperature Smart Sensor (2-Pack) in the Smart Thermostats department at Lowes.com
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NEST Learning Thermostat 3rd Gen battery replacement || How to replace CameronSino CS-NLT200SL - YouTube
Nest Thermostat Battery — OneHourSmartHome.com
Nest Thermostat Battery — OneHourSmartHome.com
How Long Does Nest Thermostat's Battery Last? (All You Need To Know) – Automate Your Life
Amazon.com: Replacement Battery for NEST T3007ES TL284443 A0013 Learning Thermostat 2nd Generation Learning Thermostat 3rd Gen Learning Thermostat 3rd Generation T3008US : Health & Household
How To Fix Nest Thermostat Low Battery - How To Digital Stuff