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dgolden(at)golden-consult
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nuckolls.bob(at)cox.net
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 Posted: Fri Oct 19, 2007 8:58 am Post subject: AA batteries... |
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Bob,
Have you seen this:
http://www.metacafe.com/watch/824477/6_volt_battery_hack_youll_be_amazed/
Dennis
--
Dennis Golden
Golden Consulting Services, Inc.
Yes.
From a design perspective, producing this
product is problematic. Simply stacking AA
cells requires some pressure be maintained
between cells. The cells also have to have
some degree of "looseness" in their cavities
for production tolerance stackup. This means
that pressure contacts are subject to fretting
corrosion not unlike the condition we've all
seen in flashlights . . . bad cases require
that you "shake" the flashlight to get it
to brighten up.
I was skeptical of the posting and went out
to purchase three brands of 6v lantern
batteries from two sources. The first flag
went up when outside measurements of the
6v battery were exactly 2x the length
of a single AA cell. Stacked height of
two layers, 16 cells each would not have
enough room inside the 6v envelope to
wire and retain the loose cells. See:
http://tinyurl.com/2busaw
and
http://tinyurl.com/2fu59k
I pulled two batteries apart to find the expected
array of 4 f-cells. The loose "f-cell" used to be a
pretty common catalog item but now seems to have
gone underground and favored only by the military
as the Mil-B-18/79; BA-401/U (carbon zinc)
and BA-402/U (alkaline?).
http://tinyurl.com/2299l6
The last commercial stronghold of the f-cell seems
to be as components of a 6v lantern battery.
Bottom line is I believe the video is a hoax.
Several folks have communicated their interest
and obtained 6v lantern batteries. One guy had
the exact same brand as shown in the video. All
6v batteries examined had 4 "F" size cells.
The nagging question is why someone would do
such a thing. I'll bet thousands of 6V lantern
batteries have been torn open with the expectation
of finding a fist-full of AA cells . . .
Bob . . .
----------------------------------------
( "Problems are the price of progress. )
( Don't bring me anything but trouble. )
( Good news weakens me." )
( -Charles F. Kettering- )
----------------------------------------
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