Silent Call SD4-SS - Manual (Page 18)

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batteries maybe purchased from a local hardware store.
Battery Installation and Replacement
To replace the battery:
1. Remove the detector from its mounting base by twisting the detector
counterclockwise. Remove the battery and dispose of it properly.
2. To ensure proper power-down sequence, wait a minimum of 20
seconds before installing new battery.
3. Install a new approved 3-volt Lithium battery in the battery
compartment. Follow the polarity diagram inside the compartment.
4. Reinstall the smoke detector onto the mounting base by turning
the detector clockwise.
5. The green LED should blink about once every 10 seconds to
indicate normal operation. If the battery is not installed correctly,
the smoke detector will not operate and the battery may be
damaged. If the detector does not appear to be sending a signal
during any of the tests, check for correct battery installation and
for a fully charged battery.