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Thanks for your help all. Looks like I am getting the ladders out

It is the outside box yes. I had no idea they had a battery in, I just assumed they worked of main power or back up battery inside the unit

Hi. I have a honeywell alarm system that started chirping away 2 nights ago. I have switched off the transformer at the socket and also disconnected the battery but it is still chirping away. Can anyone explain why please?