How to change a Grade D smoke alarm battery
- Posted On: 27 Mar 2026
All smoke alarms require a 9V battery. These types of batteries can be purchased from all supermarkets, household stores, or online. Example below.

VIDEO LINKS
You may find it easier to follow the video link below for a guide on how to change the battery.
Alternatively, a written guide is provided underneath the link. https://www.youtube.com/watch?v=gKPSLjOGDLc
WRITTEN EXPLANATION
- Safely remove the smoke alarm from the ceiling mount: a) Insert a screwdriver into the slot b) Push a small flexible panel on the side and twist c) Simply push and twist
- Remove the old battery from the detector
- Insert the new battery
- Safely replace the smoke alarm to the ceiling mount. Generally push and twist until you hear a click and the smoke alarm is secure.