- 1). Turn off the Mains power before touching the alarm or its casing. Mains alarms contain live electricity and can pose a shock risk unless the power is switched off. The Mains power switch will be accessible near your central fuse box, usually by the front door or in the basement, and you should flick the switch into the 'off' position to turn off the alarms.
- 2). Remove the casing from the front of the alarm, using the flashlight to aid visibility. This generally screws off, although some units require a push and unscrew motion.
- 3). Remove the used battery from the alarm, leveraging the end of the battery out first before disconnecting the pins. Dispose at your local battery recycling facility for safe, environmentally-friendly disposal.
- 4). Insert the replacement battery, taking care to fit it the correct way round. Be sure that the positive and negative pins correctly correspond with the fitting in the alarm.
- 5). Replace the alarm casing and turn the Mains power back on at the fuse box. Be sure to screw the alarm casing tightly back into place.