PREPARATION
INSTALLING A BACKUP BATTERY
You can install an optional 9V backup battery so if the AC power fails or you unplug the phone ( 
appears), the Sys- tem 1250 will save the memory numbers and Caller ID records. We recommend you use an alkaline battery, such as Ra- dioShack Cat. No.
Caution: Use only a fresh battery of the required size and recommended type.
Follow these steps to install a battery.
1.Use a Phillips screwdriver to remove the battery compartment cover’s screw on the bottom of the system, then remove the cover.
2.Place a fresh battery into the com- partment as indicated by the polarity symbols (+ and
3.Replace the cover and secure it with the screw.
The System 1250 automatically tests the battery each time it receives a call. If 
appears or the display dims, re- place the battery.
Important: You must install the fresh battery within 2 minutes after removing the old battery. Otherwise, you might lose the information stored in the phone’s memory.
Cautions:
•Always remove old or weak batter- ies. Batteries can leak chemicals that can destroy electronic parts.
•Dispose of old batteries promptly and properly. Do not burn or bury them.
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