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Frequently Asked Questions
  • Alarm Related
  • TV / HDTV Related
  • Changing Alarm Batteries
    • Alarm Panel Battery
    • Infrared Motion Detector
    • DUAL TEC Motion Sensor
    • 5804 Battery
    • Door/Window Transmitter
    • Recessed Door Transmitter
    • Door / Window Contact
    • Temperature & Flood
    • Remote Wireless Keypad
    • Bidirectional Fixed-Word
    • Glass Break Detector
Home Alarm Remote Control

Test Your Internet Speed
Battery Replacement Instructions
Temperature Sensor & Flood Detector
Ademco 5821

Important Notes
  • Use 3-volt lithium battery: Duracell DL 123A or Panasonic CR123A.
  • Observe Polarity
  • When replacing the battery, wait at least 30 seconds after removing the old battery, before installing the new one.

1. Remove the transmitter's top cover by inserting the flat blade of a small screwdriver into the pry-off slot at one end of the unit (see Figure 1 for location), and slightly twisting the blade until the cover disengages.

2. Install a 3-volt lithium battery as shown in Figure 1.


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