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
Cameron Sino Replacement Rechargeable Battery fit for Nest Learning Thermostat 2nd Generation (380mAh) : Amazon.ca: Electronics
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Review: Nest Thermostat strikes a perfect balance between value and features – Smart Thermostat Guide
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Nest thermostat low voltage even with C wire : r/Nest
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Amazon.com: WRUMI 420mAh TL284443 Battery Replacement for Nest Learning Thermostat 2nd 3rd, fit T3008US, T4000ES, T3007ES, A0013 : Tools & Home Improvement
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Google Nest Learning Thermostat (3rd Generation) - White | The Home Depot Canada
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NEST Learning Thermostat 3rd Gen battery replacement || How to replace CameronSino CS-NLT200SL - YouTube