and the reason I was told not to use Lithium (even though the PDF says they may be used) is because an Alkaline battery has a "gradual" decline in power so the alarm is able to do a warning chirp, and my 2 Lithium batteries simply DIED and the alarm screamed Votes Upvote Translate...
If the smoke alarm chirps several times and then stops, it is warning you that the power was off, that the alarm was on battery power, and/or that main power has been restored. Check the smoke alarm by pressing the "test" button. The alarm should sound and then stop, indicating that...
and the reason I was told not to use Lithium (even though the PDF says they may be used) is because an Alkaline battery has a "gradual" decline in power so the alarm is able to do a warning chirp, and my 2 Lithium batteries simply DIED and the alarm screamed Votes Upvote Translate ...