Re: Smoke detector and rechargeable 9V battery?

[G. Morgan <alarmpro@xxxxxxxxxxx>]

On Sun, 26 Nov 2006 02:24:04 -0500, "Robert L Bass"
<robertbass1@xxxxxxxxxxx> wrote:

>Lithium cells have a different discharge gradient from alkaline cells.  When a typical alkaline cell reaches the point where the
>detector starts to signal a low battery condition, there is a predictable remaining life in the cell.  IOW, it will continue to
>function for a sufficient period.  IIRC, lithium cells degrade at a fairly steady rate and then drop off sharply.  Assuming it's
>lithium cells and not some other type of rechargeable cell that this applies to, that would make them unacceptable for use in many
>smokes.


Lithium batteries are NOT rechargeable.  So the OP is talking about
NiMH or NiCad.  What you say is true, if you're talking about NiMH or
NiCad cells.

9V Lithium batteries are the best choice for smoke detectors because
they last so long, as much as 10 years.  You just can't recharge them.


--

-Graham

(delete the double e's to email)