Fully wired alarm system, went off in the middle of the night, seemed to suggest a sensor was tripped but nothing doing. But I noticed that I had the amber fault light and saying "Panel Battery Fault".
I went into engineering mode and it says battery is low, I'm not sure whether battery can be recharged but I suspect the battery needs to be replaced. The light has come on and off since then.
I read in old thread that required battery is 12v 7.2AH rechargeable battery.
My local electrical suppliers has a 12v 7.0 AH rechargeable battery (tores.ie). Would this do?
Are these easy to replace? Could anyone talk me through - it's only in about 3 years and the fitter is a very difficult man to get hold off, changes his number regularly, tends to be off fishing most of the time

, and doesn't have appetite for small jobs.
Also, the alarm can still be set - is the battery simply for back-up if the mains is cut or what is its purpose?
Thanks