detectors

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I have two flavors of wired detectors in rentals. One is wired to 110V and has a battery in the detector. This is plain to see since you find a piece of romex in the ceiling box. The other "has just wires" and is connected to the security system and uses it's backup battery system. if you have that kind you need to find the secuirty panel and replace it's battery or charger.