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Home Repair - - If it ain't broken, don't fix it. Otherwise look here.
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Posted by Van Chocstraw on October 21, 2009, 7:48 pm
My doorbell stopped so I checked the 3 batteries in the ringer unit
with a flash light. Sure enough, one was dead as only 2 would light the
light and the one would not with either of the other. Decided to put3
new batteries in the unit. Later went down to the bench and for some
reason check the batteries on the meter. One was 1.5 volts, the second
was 1.5 and the third was NEGATIVE 1.5 volts! Not dead. I have never
seen a D size dry cell reverse polarity. This unit did work when it was
installed 3 years ago. How is it possible for the D cell to reverse
polarity. The ringer unit is strictly batteries, no AC plug.
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Posted by Sam E on October 21, 2009, 8:33 pm
On Wed, 21 Oct 2009 19:48:42 -0400, Van Chocstraw
>My doorbell stopped so I checked the 3 batteries in the ringer unit
>with a flash light. Sure enough, one was dead as only 2 would light the
>light and the one would not with either of the other.
Since I wanted to put in a little math:
(+1.5v) + (-1.5v) = 0v
> Decided to put3
>new batteries in the unit. Later went down to the bench and for some
>reason check the batteries on the meter. One was 1.5 volts, the second
>was 1.5 and the third was NEGATIVE 1.5 volts! Not dead. I have never
>seen a D size dry cell reverse polarity. This unit did work when it was
>installed 3 years ago. How is it possible for the D cell to reverse
>polarity. The ringer unit is strictly batteries, no AC plug.
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Posted by Tony Hwang on October 21, 2009, 8:35 pm
Van Chocstraw wrote:
> My doorbell stopped so I checked the 3 batteries in the ringer unit
> with a flash light. Sure enough, one was dead as only 2 would light the
> light and the one would not with either of the other. Decided to put3
> new batteries in the unit. Later went down to the bench and for some
> reason check the batteries on the meter. One was 1.5 volts, the second
> was 1.5 and the third was NEGATIVE 1.5 volts! Not dead. I have never
> seen a D size dry cell reverse polarity. This unit did work when it was
> installed 3 years ago. How is it possible for the D cell to reverse
> polarity. The ringer unit is strictly batteries, no AC plug.
Hmmm,
Rchargeable ones can do that. But on a dry cell?
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Posted by Bob F on October 21, 2009, 8:35 pm
Van Chocstraw wrote:
> My doorbell stopped so I checked the 3 batteries in the ringer unit
> with a flash light. Sure enough, one was dead as only 2 would light
> the light and the one would not with either of the other. Decided to
> put3 new batteries in the unit. Later went down to the bench and for
> some reason check the batteries on the meter. One was 1.5 volts, the
> second was 1.5 and the third was NEGATIVE 1.5 volts! Not dead. I have
> never seen a D size dry cell reverse polarity. This unit did work
> when it was installed 3 years ago. How is it possible for the D cell
> to reverse polarity. The ringer unit is strictly batteries, no AC
> plug.
That cell had been installed backwards. The other cells reverse charged it.
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Posted by hr(bob) hofmann@att.net on October 21, 2009, 11:31 pm
> Van Chocstraw wrote:
> > My doorbell stopped so I checked the 3 batteries =A0in the ringer unit
> > with a flash light. Sure enough, one was dead as only 2 would light
> > the light and the one would not with either of the other. Decided to
> > put3 new batteries in the unit. =A0Later went down to the bench and for
> > some reason check the batteries on the meter. One was 1.5 volts, the
> > second was 1.5 and the third was NEGATIVE 1.5 volts! Not dead. I have
> > never seen a D size dry cell reverse polarity. This unit did work
> > when it was installed 3 years ago. How is it possible for the D cell
> > to reverse polarity. The ringer unit is strictly batteries, no AC
> > plug.
> That cell had been installed backwards. The other cells reverse charged i=
t.
But they could only do that if the light was turned on so there was a
complete circuit, and it would had to have been on for quite a long
time to discharge and then reverse charge the one cell.
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>with a flash light. Sure enough, one was dead as only 2 would light the
>light and the one would not with either of the other.