Have a smoke detector low battery alert, have changed batteries, can’t get alert to clear. Thanks!
A similar post can be found here.
The first step would be to identify the model of thermostat being used. It looks like this is regarding a 2GIG system. Are you using an SMKT2 or an SMKT3?
When replacing the batteries, try leaving the batteries out of the detector for a full minute. Does this resolve the issue?