To change it BE CAREFULL YOUR PANEL HAS A 240 VOLT MAINS SUPPLY.
If you are not sure switch off the main and be advised that your outside sounder
may activate through the duration of the mains being off until your battery is changed.

1.remove the cover of you control panel. The system will alarm via the tamper.
Enter your user code to silence.

2. You will see a red and black cable between the battery and the PCB.
unplug the battery via the push on spade connectors.

3. Check your new battery and locate the red terminal and plug the red lead onto this connection ditto for the black lead & connector.

4. Replace the panel cover and reset the panel.

A point to highlight is that your old battery should not be thrown in the bucket.
I discharge old batteries via a 12v test lamp and take them to my local coucil tip
and place them in the old battery skip.

 

WARNING

might it be a good idea to add taping up the terminals, and a warning not to short them, as you can get about 280 amps when directly shorted, which is enough to start a fire or kill someone.