[masraum]

Originally Posted by KC911

I didn't want to be a smartazz .... just yet . I've had that model for a few years now ... didn't even know it had batteries....

Saved me from starting a thread eventually

Yours may not have batteries. It's possible for a thermostat to get power from one of the wires coming from the HVAC unit. If that wire isn't there, then you must have batteries. If the wire is there, then I think you can have batteries anyway which might (can't remember for sure and may depend on thermostat) help with settings in the case of a power outage.