Nest Thermostat E battery replacement - iFixit Repair Guide
NEST Learning Thermostat 3rd Gen battery replacement || How to replace CameronSino CS-NLT200SL - YouTube
Does Nest Thermostat Use Battery? - YouTube
Amazon.com: CS Cameron Sino 3.70V New Battery for Nest A0013, Learning Thermostat 2nd 3rd Genera, 3rd Gen, T3007ES, T3008US, T4000ES, Thermostat E
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
Amazon.com: Google Nest Learning Thermostat - Programmable Smart Thermostat for Home - 3rd Generation Nest Thermostat - Works with Alexa - Copper
No C-wire? Install a Nest thermostat at your own risk – Smart Thermostat Guide