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'Lead Acid Battery rejuvination (was: Charging a Pb'
1999\07\27@074434 by mjurras

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Now that the subject has come up. I have some 6V sealed lead acid batteries from
the kids Power
Wheels cars that are getting weak. I have seen some advertizing and searched pat
ents on pulsing
lead acid batteries to eliminate plate sulfation. I don't think that this charge
s the batteries
rather just cleans the plates. I am interested in finding the pulse voltage, fre
quency and
duration needed to rejuventate lead acid batteries. I figure a PIC could control
it nicely. I only
plan to use it to save the power wheels batteries and maybe my cars not developi
ng a product.

As a side note. One of the 'brilliant' engineers here used a 12V supply with cro
wbar to charge his
old car battery. Wasn't he suprised when the battery hit 12V. Needless to say he
is a manager now.
His hair seems quite pointy too.

- -Mark

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1999\07\27@105220 by Terry

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During the days of NiCd cells ruling the earth, dendrites were the main
killers of NiCd cells. To counteract the growth of dendrites that would
eventually bridge the electrolyte gap and short out the battery plates, PCR
or Periodic Current Reversal was used to prevent the growth of dendrites.
Of course the other method was to cycle the battery through full
charge/discharge a couple of times to rejuvenate it.

The PCR circuit i've seen got it's DC from a full wave (2 diode) rectifier
and a negative pulse (to periodically discharge the battery) from a diode
connected through a current limit resistor to 1 of the anodes of the full
wave bridge.

What you would see at the positive terminal of the battery is a negative
pulsed DC. The charging current is 4 times the discharge current and full
charge is detected by cell temp rise.

Hope this info helps.

Terry




At 04:44 AM 7/27/99 -0700, you wrote:
>Now that the subject has come up. I have some 6V sealed lead acid
batteries from the kids Power
>Wheels cars that are getting weak. I have seen some advertizing and
searched patents on pulsing
>lead acid batteries to eliminate plate sulfation. I don't think that this
charges the batteries
>rather just cleans the plates. I am interested in finding the pulse
voltage, frequency and
>duration needed to rejuventate lead acid batteries. I figure a PIC could
control it nicely. I only
>plan to use it to save the power wheels batteries and maybe my cars not
developing a product.
>
>As a side note. One of the 'brilliant' engineers here used a 12V supply
with crowbar to charge his
>old car battery. Wasn't he suprised when the battery hit 12V. Needless to
say he is a manager now.
>His hair seems quite pointy too.
>
>- -Mark
>
>_________________________________________________________
>Do You Yahoo!?
>Get your free @yahoo.com address at http://mail.yahoo.com
>

1999\07\27@114757 by Bob Blick

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flavicon
face
Hi Mark,

Leaving all the witchcraft methods of battery rejuvenation out of the
picture for now, I have had the best success applying 13.8 volts to a 12
volt SLA or VRLA battery for 4 months(yes, 4 months).

That would translate to 6.9 volts for your 6 volt batteries.

Cheers,
Bob

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