[TechAssist] Re: Any way to revitalize dead sealed lead acid batteries?
- From: Jim Shupe <jim@xxxxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Mon, 30 Aug 2004 05:58:46 -0700 (PDT)
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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