How To Remove Battery From Hardwired Smoke Detector. Hold it for 1520 seconds and then release. I was able to contact the manufacturer USI Electric and purchase a relay module so that if any of the smoke detectors alarm I can send a signal to an external device.
This will release it and you can pull it straight off. If your old alarms are connected to three wires as shown here that means the alarms are interconnected when one alarm detects smoke they all howl. Disconnect the wire harness by squeezing the locking arms on the quick connector while pulling the connector away from the bottom of the alarm.
We have already added new detectors to each room of course but this ugly old thing is still up there doing nothing.
Replacing a hard-wired smoke detector is almost as easy as replacing a battery-powered version. If your old alarms are connected to three wires as shown here that means the alarms are interconnected when one alarm detects smoke they all howl. This will reveal the chamber where the battery is housed. Never remove the old battery without replacing it with a new battery.
