[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 12:23:52 -0400
After they've covered the whole world, maybe we'll begin to get reliably
good stuff again?
Russ Hoyt
Hoyt's TV
Exeter, NH
----- Original Message -----
From: "Jerome Silverman" <greentron@xxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Sunday, August 29, 2004 10:13 PM
Subject: [TechAssist] Re: Any way to revitalize dead sealed lead acid
batteries?
> I think its a quality problem. Each time the battery manufacture moves to
a
> different country it takes a few years before their batteries are any
good,
> if ever. But I see Sony NiCd batteries over 20 years old that come right
> back to life after a charge. Also a few months ago someone came in with a
22
> year old Panasonic lead acid battery that was still in good condition.
> Jerry Silverman
> Greentron Inc
> 4 Newland Ave Greenville SC 29609
> Fax/Phone 864 232 3889
> greentron@xxxxxxx
>
> ----- Original Message -----
> From: "Edward Gaidies" <teltek3@xxxxxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Saturday, August 28, 2004 8:58 PM
> Subject: [TechAssist] Re: Any way to revitalize dead sealed lead acid
> batteries?
>
>
> > Seems strange...with today's Technology...that someone has not come up
> > with a reliable Rechargeable Battery. Most portable electronic
> > equipment requires it.
> >
> > NIMH don't work that well either.
> >
> > -Ed-
> > Ed Gaidies
> > Tel-Tek Electronics
> > Ontario-Canada
> > teltek3@xxxxxxxxxxxx
> >
> >
> >
> >
> > On 28-Aug-04, at 8:52 PM, Jerome Silverman wrote:
> >
> > > Probably garbage, but you can try keeping them on charge for a long
> > > time and
> > > there might be some recovery. If there is any recovery you can only
> > > tell by
> > > seeing how long they will run a load. When a lead acid battery
> > > discharges,
> > > lead sulfate crystals form over the active area. When you recharge it
> > > the
> > > crystals go back into solution. If the crystals are allowed to exist
> > > for a
> > > long time, they merge into one another and become less soluble,
> > > blocking off
> > > the active area. They will still dissolve but it can take a really
long
> > > time. Thats why the instructions with the battery say to recharge
> > > after any
> > > use within 48 hours or the battery may have reduced capacity.
> > > A good quality sealed lead acid battery is supposed to retain at least
> > > 90%
> > > of its charge after one year of storage. There are a lot of poor
> > > quality
> > > batteries around and they self discharge quickly, so they are already
> > > sulfated by the time you get them and they either wont take a charge
> > > or they
> > > run down quickly in use. We used to stock and sell batteries for
> > > portable
> > > vcrs and camcorders but more and more of the batteries were returned
as
> > > defective. We started testing them as we received them and sending
> > > back the
> > > bad and weak ones. On some shipments we had to send back the whole
> > > thing.
> > > When K-Mart and WalMart started to sell them we gave up. Their
> > > over-the-counter every day price was usually less than our wholesale
> > > cost. I
> > > remember once when we were Thomson ASC and they ran out of GB90
> > > batteries
> > > which were failing like mad under warranty and they said that they
> > > didnt
> > > know when they would get more. I told them that I saw plenty at
> > > WalMart and
> > > they authorized me to buy them for the warranties. WalMart price was
> > > $39.95
> > > and the Thompson distributor dealer price was $42.
> > > Jerry Silverman
> > > Greentron Inc
> > > 4 Newland Ave Greenville SC 29609
> > > Fax/Phone 864 232 3889
> > > greentron@xxxxxxx
> > >
> > > ----- Original Message -----
> > > From: "Gary McCartney" <gary@xxxxxxxxxxx>
> > > To: <techassist@xxxxxxxxxxxxx>
> > > Sent: Saturday, August 28, 2004 6:14 PM
> > > Subject: [TechAssist] Any way to revitalize dead sealed lead acid
> > > batteries?
> > >
> > >
> > >> 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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