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- 1). Place a step ladder on firm footing under the detector. Climb up high enough to reach your smoke detector.
- 2). Remove the detector cover. If the cover is hinged to the rest of the unit, there should be some sort of button to push. If the cover can be completely removed, often it will rotate off the base of the detector.
- 3). Find the old battery, remove it from its housing in the detector case and gently pull it from the battery terminals.
- 4). Examine the new battery and determine which side is positive and which is negative. Line up the top of the new battery with the correct end of the terminal cover.
- 5). Use gentle pressure to snap the battery into the terminal cover. Return the battery to the correct area in the smoke detector unit.
- 6). Replace the smoke detector lid. Determine if the unit is operating correctly by running an alarm test. Find the test button on the outside of the detector. Push the button; if the battery is in correctly and the detector is in proper working order, the unit should emit a very loud beep when the button is pushed in.
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