What should I do if the thermostat is displaying a red battery symbol, “Low Batts”, or “Chg Batts”?

What should I do if the thermostat is displaying a red battery symbol, “Low Batts”, or “Chg Batts”?

FIX-Honeywell Thermostat Says Low Battery With New Batteries

Honeywell Thermostat Low Battery With New Batteries: Fix in

CERTIFICATION - CE & UL Certified BATTERY TYPE - 12V 9 Amp SP12-9 Rechargeable AGM Lead Acid Battery With T2 Terminals APPLICATION - Alarm System,

SigmasTek SP12-9 - 12V 9AH F2 SLA Battery - Replaces: Universal Power UB1290 (40748), UB1280HR (D5785), B&B Battery BP8-12, HR9-12, Vision CP1290

FIX-Honeywell Thermostat Says Low Battery With New Batteries

Why Is My Thermostat Blank?, Heating, Furnace, Heat Pump

Honeywell Thermostat Low Battery With New Batteries: Fix in

Honeywell Thermostat Low Battery Symptoms And How to Replace

FIX-Honeywell Thermostat Says Low Battery With New Batteries

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Leviton GSRA2 GFCI Self-Test Right Angle Plug-In 20 AMP 115 Volt Automatic Reset

Signs That Your Thermostat is Broken & How to Fix It