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
Carbon monoxyde and smoke detectors are only good for 10 years. Look at the expiration dates on yours
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.