what type of batteries do smoke detectors take

Smoke detectors can use different types of batteries, but the most common ones are 9V and AA batteries. In the past, 9V batteries were the most popular choice, but nowadays, it is more common to see two or three AA batteries in smoke detectors. AA batteries have about three times as much energy as a 9V battery. Some smoke detectors use lithium batteries, which provide a stable voltage even at low discharge, making them safer for users. Smoke detectors that come with a built-in battery and have a 10-year life-span are also available. These alarms contain lithium batteries that last for the life of the alarm, eliminating the need for battery replacements. It is important to check the batteries consistently and replace them every six months. Smoke detectors may require specific battery models, and it is recommended to follow the manufacturers instructions.