herbgh(at)nctc.com
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 Posted: Thu Dec 09, 2010 8:01 am Post subject: Battery rejuvenators/chargers |
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My understanding is that a certain amount of the sulfate compound
goes back into solution and some will fall to the bottom depending on
the severity of the build up ... The heavy duty de-sulfators hit
the plates with a high voltage pulse at some frequency..(the kit
built one from ebay via Tiawan) uses 1.5 khz as I recall...and 30
volts...The home built one uses 30 cycle half wave pulses at some
unknown voltage...(the drop across a 120 volt 100 watt bulb in series
with the diode and the battery..)... I think it depends on the
amount of sulfate on the plates. Deeply discharged batteries are the
ones that find their way to the salvage yard...and will exhibit
swelling in sub freezing weather...I would not buy those..
I went there to buy a few deep cycle batteries for
testing...(flying, Golf and now fishing)  but found that they
wanted 30 cents a pound for them..12 to 15 bucks...so I decided to
test the one I have at home that is not taking much of a
charge...Regular auto battery... I pull all of my batteries from
mowers , scooters, etc and store them in the basement this time of
year...Use an automatic charger in a rotation weekly...By the way
store them above concrete floors...I use 1x10 's on concrete blocks..Herb
At 12:37 AM 12/9/2010, you wrote:
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> it should be upended into a plastic tray and flushed with
distilled water to get most of the sulfate crystals out...
I would like to mention that no step like this is required when
using the modern desulfators. It doesn't knock off chunks. To my
understanding, which may be incomplete or in error, the physical
action takes place at the meeting of the surface of the crystal and
the current-carrying electrolyte. These is no heavy current melting
a crystal like some do to 'rejuvenate Ni-cads. Actual specific
chemical bonds are excited to a higher energy state. This weakens
and breaks them freeing them to go back into solution. The atoms
from the crystals go back into solution in an ionic state, and
continue their normal and necessary function as part of the electrolyte.
I have never shorted out a battery (with detritus building up under
the plates) because of desulfating.
If there is a chemist in the house, listen to him not me. I took
twice the number of chemistry classes than required for my
engineering degree, but that was a long time ago and my brain needs desulfated.
GeoB
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