Fire or sleep?

We (my family) woke up last night at probably about 3 to some beeping. It subsided and we went to sleep. One hour later, it beeped again, scaring the living daylight out of me and forced me to stand up and say in an almost crying voice "WHAT IS THAT NOISE?!" my mom annoyed at the noise and me goes, "It's the carbon monoxide detector. Unplug it."
Without thought, I did. I did notice it said 0 on it, but it likes to beep randomly sometimes or when we lose power.

Then while we disabled that, it beeped again. This time we realized it was the smoke detector - clearly not detecting any smoke or fire.
We fiddled around with the detector for a bit and then gave up thinking, maybe we fixed it.

Norman woke up at this point so I layed in with him, now its about 4am, until he went to sleep. I get back in my bed/my moms bed (bc I don't actually have a room here anymore) and fall back to sleep.
About a half hour later. It beeps again.
An hour later, again.
an hour later, again.
Finally I got up, and found the reset button and pressed it.
It stopped beeping, I went back to sleep, and woke up an hour later for work.

My mom said it beeped before they went out earlier today.
But I hadn't heard it since I got home at 3:30.
That was, until 50 minutes ago.
When it beeped again!

My mom bought new batteries today but we couldn't figure out how to do it.
But now I replaced all of them and am hoping that at 9:55 (5 to the hour seems to be the time they chime) it does NOT beep again or I will very happily smash every single one.