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Battery fault?

my alarm panel shows BF for battery fault and emits a beep. I have put a meter across the battery and it still holding a charge. What could the problem be? Would a new battery solve it?
Thanks
Chris Coulson, March 2021
Think of a battery as a petrol tank just because you can smell petrol, it doesn't mean there is any fuel in the tank.

j.g., May 2021