Note: I'm creating and immediately answering my own question because I wasn't able to find documentation of this solution online.
My condo is equipped with a FirstAlert 7010BSL smoke detector (technically mine is a 7010BSLA model; it appears identical to the 7010BSL). This model of smoke detector is hardwired (i.e., it uses mains/grid power) but also takes batteries to provide power during an outage.
My detector recently started beeping periodically to indicate that its batteries were low. I took out the old batteries and put new ones in, but the beeping continued. This is apparently a common problem with FirstAlert smoke detectors as the company has a dedicated help page for it.
Following the instructions on that page, I performed the following steps:
- Turned off the breaker connected to the smoke detector
- Disconnected it
- Removed the batteries
- Held the test button for 30 seconds
- Inserted new batteries
- Waited a few minutes
- Reconnected the detector
- Turned the breaker back on.
After this process, the detector continued emitting the low battery warning.
What might be the solution to this problem?