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Thanks Sparkymarka. I bought the exact same battery as the original so I'm happy it should be the correct one. When should I swap the magnetic contact on our front door in this process? I guess I don't want to do it with the battery in place or the mains on, I don't want to blow a fuse...

Hi, We've inherited a Eurosec CP8L system (installed 2003) that has been in absolutely great working order. However, our magnetic door sensor failed and the battery in the main alarm panel needs replacing. Our local installer charged us £150 to come out to look at the magnetic door contact...