Amplicomms BigTel 50 Alarm Plus User Manual page 49

Testing the emergency call unit battery
1. Press and hold the button (1) on the emergency call unit briefly. The
LED (2) lights up.
2. If the LED (2) no longer lights up when the button is pressed and held,
replace the battery.
Replacing the battery
1. Remove the screw on the rear side of the emergency call unit using a
small, crosstip screwdriver.
2. Insert the tip of a small screwdriver in the notch (3) and open the
housing.
3. Replace the battery. Only use batteries of the same type. Pay atten-
tion to correct polarity.
4. Close the housing.
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