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rlborger(at)mac.com
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 Posted: Fri Aug 09, 2013 11:14 am Post subject: Fwd: How to test a battery |
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'Lectric-List folks,
Your commentary on this test would be appreciated.
Best regards,
Robert Borger,
Sent from my iPad
Begin forwarded message:
[quote] | Quote: | Interesting. I have never heard of this.
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[b]
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nuckolls.bob(at)aeroelect
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| Posted: Fri Aug 09, 2013 4:22 pm Post subject: Fwd: How to test a battery |
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At 02:13 PM 8/9/2013, you wrote:
| Quote: | 'Lectric-List folks,
Your commentary on this test would be appreciated.
Best regards,
Robert Borger,
Sent from my iPad
Begin forwarded message:
| Quote: | | Quote: | Interesting. I have never heard of this.
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Youtube can be a fun place. I'll check this assertion
out next time I've got some dead AA's in hand.
A few years ago somebody did a youtube feature on the disassembly
of a 6v spring-post lantern battery to show that it contained
32, AA cells. Since that time, dozens of folks have dug
out their cameras to show that the 6v lantern battery
does NOT contain a sack full of AA cells . . . here's
what's REALLY inside.
http://www.youtube.com/watch?feature=player_detailpage&v=TBQDGvhr3kE
I've got a scale that measures to .1 gm and we can
see if dead AAs loose any density and/or acquire
and inner core that is cousin to a golf ball.
Bob . . . [quote][b]
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Eric M. Jones
Joined: 10 Jan 2006
Posts: 565
Location: Massachusetts
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| Posted: Sun Aug 11, 2013 7:22 am Post subject: Re: Fwd: How to test a battery |
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I watched the You Tube and decided to test my own collection of 30 new and partially used AA batteries from my grandson's toys. I have a first-rate B-K Precision model 815 test meter (with a AA-cell test scale!) for comparison.
I sorted the batteries by bouncing the negative end on a marble slab. Some batteries were indeterminate, so it was not a clear choice for all batteries. Nevertheless, it seemed to make some sensible division.
When the two piles were examined, it was easy to see that many weak or dead AA batteries did bounce and fell over. Many good ones tended to stay erect and not fall over. As I mentioned, there were many indeterminate batteries.
Notes: --Trying to Drop the batteries straight down introduces some error.
--Some construction features of the batteries, such as plastic sleeves that were too long, or details of the end contacts might have caused some problems.
--I used "below 1.4V" as dead. This is arbitrary.
Conclusion: The test is illustrative and interesting but not definitive. My suspicion is that the stress on the battery increases when the battery gets weak, due to a slight pressure increase caused by the chemistry products volume. This is enough to stress the ends and cause it to bounce when dropped on its end,
It might make a good science project. Wiki: Alkaline battery construction.
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_________________
Eric M. Jones
www.PerihelionDesign.com
113 Brentwood Drive
Southbridge, MA 01550
(508) 764-2072
emjones(at)charter.net |
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mrspudandcompany(at)veriz
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| Posted: Sun Aug 11, 2013 8:29 am Post subject: Fwd: How to test a battery |
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| Quote: | Conclusion: The test is illustrative and interesting but not definitive.
My suspicion is that the stress on the battery increases when the battery
gets weak, due to a slight pressure increase caused by the chemistry
products volume. This is enough to stress the ends and cause it to bounce
when dropped on its end,
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I am inclined to place this in the catagory of
male bovine excrement!
But that is just one man's opinion.
Roger
Do not archive
--
Do you have a slow PC? Try a Free scan http://www.spamfighter.com/SLOW-PCfighter?cid=sigen
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nuckolls.bob(at)aeroelect
Guest
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| Posted: Sun Aug 11, 2013 8:47 am Post subject: Fwd: How to test a battery |
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At 10:22 AM 8/11/2013, you wrote:
I watched the You Tube and decided to test my own collection of 30
new and partially used AA batteries from my grandson's toys. I have a
first-rate B-K Precision model 815 test meter (with a AA-cell test
scale!) for comparison.
I sorted the batteries by bouncing the negative end on a marble slab.
Some batteries were indeterminate, so it was not a clear choice for
all batteries. Nevertheless, it seemed to make some sensible division.
When the two piles were examined, it was easy to see that many weak
or dead AA batteries did bounce and fell over. Many good ones tended
to stay erect and not fall over. As I mentioned, there were many
indeterminate batteries.
Notes: --Trying to Drop the batteries straight down introduces some error.
--Some construction features of the batteries, such as plastic
sleeves that were too long, or details of the end contacts might have
caused some problems.
Good data
--I used "below 1.4V" as dead. This is arbitrary.
Will make note of that in my attempts to
repeat the experiment . . . I think the 'dead'
one in the video measured 1.2v
Conclusion: The test is illustrative and interesting but not
definitive. My suspicion is that the stress on the battery increases
when the battery gets weak, due to a slight pressure increase caused
by the chemistry products volume. This is enough to stress the ends
and cause it to bounce when dropped on its end,
Interesting hypothesis
It might make a good science project. Wiki: Alkaline battery construction.
Agreed . . . more tests are needed . . .
I'll gather up some test subjects and
see if my grandsons are interested in
doing/observing the experiment.
Bob . . .
---------------------------------------
( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
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