Base station batteries

The base station batteries are RECHARGEABLE, so don't need to be replaced until they fail.  This often will depend on how often and how long your power goes down.  I still have the original batteries in mine, which is many years old.

Thank you  - will the system tell you if the batteries need to be replaced in the base station ??

No.

It's like most battery-backup type of systems. You know it's time to replace the batteries if the power goes out (or you unplug it to test the backup) and the battery run time is abnormally short.

how many years for the rechargeable batteries in the base station to be replaced?