How do I know which smoke alarm battery I need?

How do I know which smoke alarm battery I need?

- Press and hold the test button on your smoke detector until the alarm sounds. ... - Remove the battery from the battery compartment if your smoke detector uses the battery only as a backup. ... - Remove the 9-volt battery from the detector.

What is the best 9 volt battery for a smoke detector?

Energizer Industrial Alkaline 9V Battery

How do I change the battery in my alarm control panel?

https://www.youtube.com/watch?v=wRzBgjYhOq0

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