If the battery was left on for 3 years then yes it is dead, if not then you will need to turn battery on before you shut system down after programming. On your admin phone, normally 1st extension, it should tell you if battery is dead or not turned on.


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Voice and Data Cabling in DFW, [email protected]
https://www.dnrcomm.com


Voice and Data Cabling in DFW, [email protected]
DnR Communications