To change batteries in a smoke detector, remove the plating, take out the old battery, and place a new battery in the compartment. Most smoke detector batteries accept 9-volt batteries.
- Remove the cover
Detach the plate of the smoke detector by twisting it.
- Remove the old battery
Remove the old battery from the compartment.
- Install the new battery
Place the new battery in the compartment, and ensure that the plus and negative terminals are properly aligned. Place the cover on the unit.
- Test the detector
Make sure the detector is working by pressing the button on the unit to hear a beeping sound.