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 Post subject: Battery question please?
PostPosted: Sat Apr 29, 2017 6:54 pm 
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Hello.
Some years ago my sister and I both purchased remote door bell sets from
our local shops, different manufacturers from different shops. In each case
the main unit was powered by three AA batteries.

Both units failed after a short period and in both cases it was found that the
middle one of the three batteries had discharged to a point that the unit
would no longer function. In addition to this, it was found that in one case
the battery had not only discharged but had also reversed its polarity.

Is there any precedent or known reason for this please?

All on topic replies will be welcomed.
Thank you, Peter3


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PostPosted: Sat Apr 29, 2017 7:07 pm 
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Battery polarity. Check that the orientation of the batteries in the devices is as per the compartment marking. They don't always go alternate positive/negative, sometimes they all go in the same way around. Confusing, but that's just the way it is and the symptoms you describe point to that as being the cause..

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PostPosted: Sat Apr 29, 2017 7:10 pm 
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Sounds to me as if the middle battery was somehow put in the opposite polarity to the other two.

Too slow k-e was faster.


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PostPosted: Sat Apr 29, 2017 7:35 pm 
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Thank you both for the replies.
You both may well be right but as we no longer have the units I cannot confirm either way.
Thank you anyway.
Regards Peter3


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PostPosted: Sat Apr 29, 2017 7:59 pm 
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Believe it or not, it has been known for a battery to change its polarity. From what I remember it only happens in batteries, not cells, so having 3 cells in series makes a battery, sadly I can not recall much more, but I do know when it first happened to us (at work) people were blamed for putting cells in the wrong way round.

The other thing is wireless door bells are rubbish, no matter which one / make / model you get they don't seem to last much past 2 years, its not just the battery failing, its often water ingress into the "call button"

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PostPosted: Sat Apr 29, 2017 8:17 pm 
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i had a ryobi 18v battery cell go wrong polarity whilst i was there :scratch:
put it on charge after a while a big bang and the spot on the battery was extremely hot now normally i would open up and look but because it was less than a year old and it took the charger out with it i swaped it for another :lol:

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PostPosted: Sun Apr 30, 2017 8:48 am 
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Many thanks to Someone_else for the confirmation
After ditching the original units, we purchased better quality products where
the main units use two C cell batteries. They are still functioning without problem.
Should say however, in both cases the push buttons are not exposed to the
elements.
Thank you again Peter3


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