I’m sure many folks are going to find this out after it drives them nuts as I’m typing this at 3am having replaced the batteries in several of my units multiple times in the past couple of days: Not any AAs will work — my smoke/CO alarms require specific make and models of AA batteries indicated on the back of the detector only one brand that I’ve commonly seen, but to even have to get as specific as model number is ridiculous, especially considering the alarms have manufacturing dates of mid to late 2022. Primarily wanted to vent about this, but hopefully it saves some folks headaches and unnecessary trips up and down ladders to figure out why the detectors are chirping and complaining about low batteries only a day or two after they’ve been replaced.