Could Aritech Alarm Battery be causing circuit breaker to trip?.

So my MCB started tripping intermittently and now will not stay on.
From what i can see, that particular MCB has on it my house alarm, my electric gates and driveway lights.

Before this happened I noticed that my (Aritech) Alarm key panel was reading Battery Low Power. I didn't do anything about it as we don't really use the alarm much.

So i thought main suspect was probably the Gate motors as it had been raining and water tends to gather in the motor case well in the ground.
As it's quite a big job to start messing with the gates, i thought the dead/expired battery in the alarm may be causing the MCB to trip.
Does this sound plausible? Has anyone seen it before?
When i get a chance i plan to remove the fuse in the dedicated spur to the alarm to isolate it from the MCB. I'm hoping that will answer my question.