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Hi, I'm Nathan.Sorry to hear that you're having trouble with this but I'll do my best to help you.
That does indicate a battery issue. If you are not using the system, you'll need to remove the backup battery and the mains power supply.
There should be a metal box mounted on a wall, usually in a closet or utility room, inside you'll find a small 12v battery to disconnect. Nearby there should be a wall power adapter which also needs to be disconnected. With both off, it should stop the beeping. The ademco box is the one for the alarm, others are likely for phone and internet.