I just checked my iCloud backups and I am happy to report that my iPhone and iPad have recently backed up. iPhone last night, iPad two days ago when I last charged it.
Also, my carbon monoxyde and smoke detector battery is still healthy
Important: Carbon monoxyde and smoke detectors are only good for 10 years. Look at the expiration dates on yours
Funny fact: Removable batteries in those are now illegal where I live, they have to be either wired with 10 year battery backup, or 10 year battery devices. That's because people either removed the batteries or didn't replace them when they died; I'll let you imagine the rest of the story.