This attachment script from Norman Laskey tracks and logs the "I Am Alive" RF messages from some battery operated security modules and automatically sends a warning email if it looks like the battery needs to be replaced.
After downloading, drag the _battery dead notify attachment.scpt_ file
_/Library/Application Support/Perceptive Automation/Indigo 2/Scripts/Attachments/_
Read the script comments and create a repeating Time/Date Action for every four hours to call the calcInterval() function. Restart Indigo or reload the attachments.