My guess: It's coolest at night, and the voltage drops slightly at night as the battery cools off Archived Message Posted by IlliniOllie on June 7, 2022, 7:10:05, in reply to "Why do smoke detector batteries always go bad at 2 am?*" if a weak battery is close to the voltage threshold where it triggers the beep, it'll dip below it for the first time at night when it's coolest. I suspect this isn't really the reason, but it seems like it would make sense. Previous Message Nm Message Thread: Why do smoke detector batteries always go bad at 2 am?* - Stu June 7, 2022, 5:25:36 i mean, what is the deal with that?* - Nobster June 7, 2022, 7:41:14 because you touch yourself at night - IlliniSax05 June 7, 2022, 7:10:54 My guess: It's coolest at night, and the voltage drops slightly at night as the battery cools off - IlliniOllie June 7, 2022, 7:10:05 even if this isn’t right I appreciate it. - memyselfandillini June 7, 2022, 7:41:18   Searching