So at 2 freaking 30 am, my CO2 detector starts beeping. I investigate. It starts screaming instead.
I grab my cat, her leash, my warm robe, open all the windows and sit outside. I google what you're supposed to do when the alarm goes off. Call 911. Okay, I do.
Fire dept shows up about 15-20 min later. Cat is freaking out. She wants to go inside. We're both freezing.
Fire dept walks around the apartment for a minute or so with little detector looking devices, then one asks if I have any AA batteries. And maybe some steel wool.
Turns out the old batteries had started corroding the detector. They fix it up, and go on their way.
Now I'm just waiting for my adrenaline to go away, and maybe for my anxiety to stop trying to ask, "well what if it wasn't just the battery, and now they're gone?"