Scantronic 9800 BF Error message

["psheratonNOSPAM@xxxxxxxxxxxxxx" <psheraton@xxxxxxxxxxxxxx>]

Hello People

Before i start yes i have done my reaserch and looked this error
message up, but need more advice.

I have a Scantronic 9800 which keeps bringing up the error message of
BF and i have to enter my user code to stop it but it keeps going off
again.

Ok I need a short term fix so i cut the speaker cable but it is still
making a noise from the key pad terminal thingy!  I have read if I
enter the engieenr code it will stop the error.

I have also read I need to replace the battery which is in the main
control panel (in my loft) see how to below: (is this safe to do)?
http://groups.msn.com/UKSecurityPanels/changebattery.msnw

Ive also read it needs a '12V7AH Battery' is that right?

Thanks
Paul