Low Battery: Carbon Monoxide Sensor

If a Carbon Monoxide Sensor reports a low battery, we recommend replacing it as soon as possible (although you will typically have a few weeks before completely drained). Please use the below photos to identify the sensor model for which was reported to have a low battery, and refer to the corresponding directions to replace the battery.

This Carbon Monoxide Sensor takes 2 CR123A batteries and the typical battery life for the sensor is 3-5 years.

• Rotate the body counterclockwise to remove it from the back casing.
• Slide open the battery compartment to replace the 2 CR123A batteries on the back of the body.
• Reattach the battery cover then attach the body back to the base with a clockwise twist.

This Carbon Monoxide Sensor takes 3 AA batteries and the typical battery life for the sensor is 3-5 years. 

• Slide the body sideways to remove it from the back casing.
• Replace the 3 AA batteries on the back of the body.
• Slide the alarm body back onto the mounting plate. The mounting plate will not close if all three batteries are not installed.