[TechAssist] Re: Any way to revitalize dead sealed lead acid batteries?
- From: "Jerome Silverman" <greentron@xxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Sun, 29 Aug 2004 22:13:47 -0400
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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