[TechAssist] Re: Any way to revitalize dead sealed lead acid batteries?
- From: "Hoyt's TV" <hoytstv@xxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Mon, 30 Aug 2004 12:27:11 -0400
Some years ago I read about that reverse charge method to rejuvenate the
surface of the plates, but it never worked for me.
Russ Hoyt
Hoyt's TV
Exeter, NH
----- Original Message -----
From: "J Silverman" <greentron@xxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Monday, August 30, 2004 11:50 AM
Subject: [TechAssist] Re: Any way to revitalize dead sealed lead acid
batteries?
> Thanks for the tip. I have a big box full of lead-acid camcorder and
medical
> equipment batteries that I have not yet turned in for recycling. We have
> never had any luck restoring these. Most wont draw any current from a
> charger, forward or reverse. If I leave one on charge for a long time,
like
> a few days, it may start to draw a continuous, small current. But it just
> eventually gets warm and if I remove it from charge and put a load on it
the
> voltage drops to almost nothing. I guess there is no hope for those but,
> aside from the sulfating problem, I always wondered what else was going on
> inside.
>
> Jerry Silverman
> Greentron Inc
> 4 Newland Ave
> Greenville SC 29609
> Fax/Phone 864 232 3889
> mail to: greentron@xxxxxxx
> ----- Original Message -----
> From: "Jim Shupe" <jim@xxxxxxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Monday, August 30, 2004 8:58 AM
> Subject: [TechAssist] Re: Any way to revitalize dead sealed lead acid
> batteries?
>
>
> > Gary...
> >
> > Try reverse-charging (limit current to an amp or
> > less) for a few seconds to a minute to get things
> > going, then forward-charge at no more than 14.75V
> > until the current drops below about 100ma. If this
> > restores some charge to the battery, put it through
> > several normal charge-discharge cycles to achieve the
> > best capacity for THIS particular battery(I assign
> > batteries a "personality", unique to each one's
> > "experiences").
> > If not much happens the first time, repeat several
> > times before giving up. In my experience, it depends a
> > lot on the brand and storage conditions(the cooler the
> > better).
> > I used to manage storage, maintenance and testing of
> > gel-cell batteries as a test engineer for a medical
> > equipment manufacturer, so I experimented with and
> > researched a lot of this stuff.
> >
> > Batteries are still a long way from a reliable
> > device. BTW...somewhere I have a schematic for a very
> > good, simple two-stage gel-cell charger if you need
> > one.
> >
> > Jim Shupe, CET
> > Lloyd's TV
> > Yucca Valley, CA
> >
> > --- Gary McCartney <gary@xxxxxxxxxxx> wrote:
> >
> > > I found a box of 10 brand new sealed lead acid
> > > batteries, 12V 4AH that I
> > > forgot I had. Problem is, they are all very low or
> > > dead. I tried
> > > connecting my power supply with current limiting but
> > > the batteries
> > > aren't drawing any current at all.
> > >
> > > Is there any way to kick these into charging up, or
> > > are they garbage?
> > > --
> > >
> > >
> > >
> > >
> > > Gary McCartney
> > >
> > > McCartney Electronics
> > > Guelph Ontario Canada
> > > Est. 1984
> > > email: gary (at) number63.ca
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
>
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