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4hv.org :: Forums :: General Science and Electronics
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Bizarre battery birth

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klugesmith
Sat Nov 23 2013, 04:50AM Print
klugesmith Registered Member #2099 Joined: Wed Apr 29 2009, 12:22AM
Location: Los Altos, California
Posts: 1716
The other day I was testing a bunch of old dry cells.
Found a 9-volt battery which had spontaneously delivered, through the bottom of the case, one of its AAAA-like cylindrical cells.
Who's seen that happen before? I sure hope it's as rare as coffin birth.

1385182188 2099 FT0 Dscn7061cr
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Bjørn
Sat Nov 23 2013, 11:54AM
Bjørn Registered Member #27 Joined: Fri Feb 03 2006, 02:20AM
Location: Hyperborea
Posts: 2058
I have had that happening with 30 mA reverse current. I know of one 4HV member that had it happen under normal use so it happens from time to time.
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Conundrum
Sat Nov 23 2013, 03:58PM
Conundrum Registered Member #96 Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4061
Had one explode before, I think its internal gassing.
Nice pic btw, just shows how the strangest things can happen.
I'm amazed this doesen't happen more often with cheap imported batteries, usually they quality check them but evidently in this case not.
9v's are prohibited in international mail unless in their original packaging...
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Alex M
Sat Nov 23 2013, 06:44PM
Alex M Registered Member #3943 Joined: Sun Jun 12 2011, 05:24PM
Location: The Shire, UK
Posts: 552
I've had the top blow off one once when it was sitting on a shelf for a few months. It gets quite cold in here during the winter nights so it could be temperature related.
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Mads Barnkob
Sun Nov 24 2013, 10:56AM
Mads Barnkob Registered Member #1403 Joined: Tue Mar 18 2008, 06:05PM
Location: Denmark, Odense C
Posts: 1968
If you connect two 9V together, this will happen too ;)
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Ash Small
Sun Nov 24 2013, 11:42AM
Ash Small Registered Member #3414 Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
klugesmith wrote ...

Found a 9-volt battery which had spontaneously delivered, through the bottom of the case, one of its AAAA-like cylindrical cells.

1385182188 2099 FT0 Dscn7061cr


Cell replication??? smile
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radiotech
Mon Nov 25 2013, 10:09AM
radiotech Registered Member #2463 Joined: Wed Nov 11 2009, 03:49AM
Location:
Posts: 1546
I seem to remember the iron rod coming out too.
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