Review on Enegitech 4 Pack 9V 1200MAh Non-Rechargeable Li-Ion Batteries For Smoke Detector, Fire Alarm & Multimeter by Doug Darling

With 8 smoke detectors and 2 CO detectors in the house, I got tired of the batteries needing changing frequently and definitely loathe the midnight chirping (why do they only chirp in the middle of the night?!?!?). This is actually a belated review as I first purchased these batteries 4 years ago. My first smoke detector started chirping last night, 4 years after my initial purchase. So, here I am ordering a new set. I plan to replace all of the batteries at once now that the first detector has chirped. There is probably more life in these batteries, but I am unwilling to wait for each detector to chirp before swapping batteries. For the convenience of not dealing with 8 chirping smoke detectors and changing the batteries annually, these are well worth the cost. Do note that they are sized a little funny so they do fit our First Alert brand smoke detectors but not the CO detectors.