Here is how you change the battery in a First Alert smoke detector with a slide-out drawer for the battery. Thank you for watching and don't forget to test your alarms and change the batteries.. To change the battery in First Alert Smoke and , you will need to locate the battery compartment, typically found on the back of the alarm. Once you have located the battery compartment, remove the old batteries and insert the new ones.
Learn how to change the battery in a First Alert smoke detector with our helpful articles. Keep your home safe and secure with our step-by-step guide!. This video will show you how to replace 9V and AA batteries on First Alert and BRK smoke and Carbon Monoxide detectors.