The IS-ZW-TSTAT-100 requires three AA Alkaline batteries. Batteries are used for backup in case of power loss. It is not recommended to use the batteries as the primary source of power.

To replace the batteries in a GE/UTC Z-Wave Thermostat:

1. Press the Heat/Cool Mode button to Off and press the Fan button to Auto.
2. Remove the bottom cover section to access the battery compartment.
3. Install three AA Alkaline batteries according to the polarity noted in the battery compartment.

   Important: Do not use rechargeable batteries.
    

4. Replace the bottom cover.