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 490-0466 Smoke Detector

Question: How long should the battery last and how do I know when it's low?
 
Answer:
 The smoke detector is powered by one 9 Volt battery. The battery should last for at least one year under normal operating conditions. The smoke detector has a low battery indicator, an audible "beep." It will operate at 30-40 second intervals for a minimum of 7 days. When this indication occurs, replace the battery with an Enercell Alkaline 9V battery (Cat. No. 23-875). You should not use the new Enercell Plus Alkaline batteries, as the smoke detector is a low-drain device; you would not see a significant increase in battery life.

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Question: Why is this is beeping once per minute?
 
Answer:
 This is the low battery indicator. You need to replace the battery with an Enercell Alkaline 9V battery (Cat. No. 23-875).

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