Amazon.com: DRECHAS [680mAh] TL284443 Battery, 2023 New Upgraded High Capacity Li-Polymer Replacement Battery for Nest Learning Thermostat 2nd 3rd Generation, T3007ES, T3008US, T4000ES, A0013, Smart Home Battery : Tools & Home Improvement
NEST Learning Thermostat 3rd Gen battery replacement || How to replace CameronSino CS-NLT200SL - YouTube
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