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How long will a bell box ring if it has no battery back up in the main panel and the power is taken out? It's the Glaxey 16 plus alarm panel (ADT). Thanks to all in advance

OK, some years ago I had this alarm install by ADT (worked from home at the time). But about 7 years ago, I stopped the contract with them and the alarms been sitting doing nothing since that day. However, we had a power cut the other day and all hell let loose! I would now like to...