How can smoke detectors best be maintained?

Maintaining smoke detectors is essential for ensuring they function properly during emergencies. Regularly testing and replacing batteries helps to ensure that the smoke detector is operational at all times. Smoke detectors can fail to alert you to smoke if the batteries are dead or low. Testing the detectors monthly ensures that the internal mechanisms are working properly. Replacement of batteries should typically be done at least once a year, or according to the manufacturer's recommendations, to ensure optimal efficiency.

In addition to testing and battery replacement, it’s also crucial to remember that smoke detectors might need more comprehensive maintenance practices, such as cleaning and eventually replacing the entire unit, which is not addressed in the other options. Therefore, the routine practice of caring for smoke detectors by confirming they are powered and functioning properly is paramount, making this the most accurate method of maintenance.