Smoke alarms are finicky about battery brands. Look inside the alarm or on the back to see if specific battery brands/numbers are recommended.
See page 13 of the official instruction manual at:
http://psaproducts.com.au/Assets/documents/PDF/Fire%20DataSheet/5800%20and%205800RL%20manual.pdf
The following 9-volts are recommended:
EVEREADY/ENERGIZER 522
DURACELL MN1604, MX1604
If alarm is over 5 years old (or past the date printed on the alarm), toss it and get a new one. They don't last forever. Be safe!
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