Thanks blueliner for your comments and suggestions.
Can I ask you a question about changing batteries in smoke detectors? Well, I guess I will....
All the smoke detectors in my house are "chained" together (if one alarms they all do) and they are powered both by AC and have batteries for backup. I have noticed that the 9 VDC batteries last for years before I start getting a low battery chirp alarm. I assume that is because AC power is primary & the battery is for backup only. Assuming what I just stated is really correct; is it safe to go for long periods of time before replacing the batteries? I image most newer homes have smoke detector systems like mine.
05/89 NCL, Seaward, 1990 Carnival, Topicale, 1991 Carnival, Festivale, 11/93 Wind Star, Wind Song, 01/95 Celebrity, Horizon, 01/96 Celebrity, Century, 01/00 Celebrity, Zenith, 01/01 Princess, Ocean Princess, 01/02 Princess, Ocean Princess, 01/03 Celebrity, Summit, 05/04 Princess, Diamond, 01/05 Celebrity, Galaxy, 01/07 Oceania, Regatta, 01/08 RCCL, Voyager of the Seas, 02/09 RCCL, Voyager of the Seas, 01/10 Celebrity, Solstice