and are the existing batts that went in on the original install back in 1993!Īnyway my question is. I had a call-out this morning to look at a fire alarm system (not one of our contracted sites) and found a 1993 Menvier 2 zone non-addressable control panel (no model number? but the type where you have to turn the key left to silence and then turn the key right to reset if anyone knows the model?) anyway this is running Esp-Fireline (PSD-2) smoke detectors, apparently these had been 'upgraded the last couple of years' needless to say the back-ups batts in the panel have never been replaced.
