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Just guessing but the problem when you opened the case to change the battery. That tripped the tamper alarm. On my system it is part of the BIOS and I need to go in to the BIOS to reset it and or turn it off. These links may help:
Most alarm systems require you to reset the tamper alarm.
Most systems will reset the tamper simply by arming the system and then immediately disarming the system. However, you MUST make sure that the Tamper circuit you tripped is closed. If you removed the cover on the panel, make sure the tamper switch for the cover is in the correct position and that the cover is pressing the switch and closing its contacts. If you are trying to arm the panel with a cover off, the tamper circuit will not reset unless you defeat the tamper switch. Just make sure you remove the defeat when you replace the cover. You may also wish to try a google search on the type and model of panel you have so you can download a copy of the manual to check on the reset procedure. We also need to know what brand and model the panel is so we can help you further..
If you are disarmed, you should only get a trouble signal when you remove AC power, This should clear when power is re-established. The tamper is a switch inside the panel that trips when the door is opened. This too should be only a trouble if the panel is not armed. (Unless the tamper is programmed for instant alarm like a panic or fire alarm input.) Check your manual for the programming instructions for bypassing or disabling the tamper. Another thing you can do is disconnect the backup battery before removing the AC power, this will stop any alarms, but you should notify your monitoring company first.
If it is the tamper alarm configured by your BIOS (which you can determine by the sound's complexity--if you're hearing anything more complicated than a monotone beeping it's not BIOS controlled) I recommend restoring the default settings in your computer's BIOS setup.
Find out where the tamper fault is. This panel has tamper monitoring for external bell remote keypad zones and cover. Check all devices for loose covers ,wiring for breaks (especially if new carpets fitted) and bell box.You can check for continuety with a multimeter inside the panel you should have a short between A/T terminals and between 0v and TR if not check the wiring.