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Best 9V for Smokes

Discussion in 'Security Alarms' started by Bob La Londe, Oct 10, 2010.

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  1. Bob La Londe

    Bob La Londe Guest

    A long time ago upon the advise of a couple ASA regulars I started using
    nothing but Coppertops for smoke detectors that use 9V batteries. Before
    that I tried cheap batteries, other brands, and even expensive lithiums.
    The Coppertops seem to have given me the least trouble over the years. The
    other day I was making my routine recommendation to a non-client and he
    jumped all over me that Consumer Reports says except for generic no-names
    they are all the same.

    It wasn't the first thing he jumped on me about of course. As snowbird he
    had already pointed out to me how so many things were superior where he came
    from over Arizona. (I had to bite my tongue to keep from telling him to go
    back there then. I really hope he doesn't call me back to install his

    Anyway, its been a long time since I did a timed load test, but back then
    there was a definite difference in discharge curve between Energizers and
    Coppertops. The Energizers would maintain a higher voltage and then drop
    off suddenly. The Coppertops would maintain useable voltage levels for
    longer but more steadily decrease.

    The summary I came to was that devices that can operate effectively on lower
    voltage levels would benefit from Coppertops (like incandescent bulb
    flashlights) where as devices that needed a more constant power supply (like
    charging the discharge caps on a photo flash quickly) would benefit from the
    use of Energizers.

    All that being said, what do you guys use for 9V batteries in smokes? Why?

    I don't actually run into it often except in a few wireless systems I have
    installed, but it does come up when I get the classic, "Your smoke detector
    is beeping," call from a client who doesn't understand that if there was a
    problem with an alarm smoke it would show up on the keypad too.
  2. David 01

    David 01 Guest

    I used to use almost exclusively 9V Energizers (more for the old ITI
    Wireless transmitters than smokes, but I did notice one thing back then.
    The Energizers were longer than the Duracells making them tight to get
    into some smokes (that were originally supplied with Duracells and I
    guess designed just for them). I've been out of the business for several
    years and don't know if the sizes are still the same. I personally had a
    lot less problems out of Energizers and they did last longer for me.
  3. 10yr Lithiums. Because I don't see the point in climbing a ladder 12 times every
    year, or dealing with the bvlasted low battery chirping at 2AM.
  4. Jim Rojas

    Jim Rojas Guest

    I used the ultralife batteries. On devices that were power hungry, I
    would add a 2nd battery in parallel if there was room.

    Jim Rojas
    Technical Manuals Online!
    8002 Cornwall Lane
    Tampa, FL 33615-4604
  5. I fitted 10 year lithiums in my parents' 2 smoke detectors, and they
    lasted 3-4 years. (I can't recall what make, and I've chucked them now.)

    I've replaced them with SAFT lithiums which are roughly the size of
    a 9V battery and with same clip on the top, but you can see these are
    made from 3 lithium cells shrink-wrapped, so they're lumpy rather than
    perfectly rectangular.

    I did smile at the warning on the side: "may explode in fire".
    I guess that's a handy backup if the smoke detector doesn't go off,
    providing they make a loud bang ;-)
    They are sold as smoke detector batteries. Not been in long enough to
    comment on their longevity.
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