[TechAssist] Re: Any way to revitalize dead sealed lead acid batteries?
- From: Gary McCartney <gary@xxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Mon, 30 Aug 2004 22:26:25 -0400
Ed, I checked the battery and all it says on it is "Exaltor 1240". The
batteries are the type you'd use in a computer backup UPS.
Gary McCartney
McCartney Electronics
Guelph Ontario Canada
Est. 1984
email: gary (at) number63.ca
Edward Gaidies wrote:
> Gary;
> Are you sure they are Lead Acid?
> Presuming that they are..."Shocking" and reverse polarity will not give
> you a viable battery for resale.
>
> Best thing I learned from this post, was the guy that tried to top
> these batteries up in the Medical Field.
>
> I think most of us have no idea what is required, even the
> manufacturers don't know.
>
> Watched a program on TV..two weeks ago, manufacturing batteries for
> Vehicles.
>
>
> I recorded most of them...
> But I presume..if someone invented a "Battery" that only needed
> recharging and no replacement, someone would soon be out of business.
>
> Too bad we are "Fixers" and not "Inventors".
>
> I will not go (OIL/INTERNAL COMBUSTION/GONE TO THE MOON AND BACK) and
> we can't even get a decent battery to power our Digital Cameras.;-)
>
> Damn..(sorry)..every time I think about it...Some big company decides
> what we need.
> They will give us Printers for under $30....next time you need a
> Cartridge $42.95.
> And now they have purposely installed a "CHIP" so you can not refill
> them.
>
>
>
> Do I need to expand? Probably not.
>
>
>
>
> Ed Gaidies
> Tel-Tek Electronics
> Ontario-Canada
> teltek3@xxxxxxxxxxxx
>
>
>
>
> On 30-Aug-04, at 9:32 PM, Gary McCartney wrote:
>
>
>>Jim, thanks for the suggestion. So far I have tried the reverse
>>charging
>>on one battery. Here is what my observations are:
>>
>>-initial battery read 4.1V and would not supply current to a load
>>-reversed charged for several seconds but would not draw more than
>>100mA
>>during this time.
>>-then normal charged where it would only draw a few 100mA. Got up to
>>7.3V after a few hours and wouldn't supply current to load
>>-reversed charged again and this time it drew around 200 mA
>>- normal charging would now draw 100mA but still wouldn't supply much
>>current to a load. A small lamp lit dimly for 5 minutes and went out.
>>-repeating the reverse charge- normal charge cycles seems to allow more
>>current to be drawn each time.
>>- last I tried, I was able to draw over 1 amp reverse charge and 200 mA
>>normal charge. Battery reads 9.4V after a few hours charge but won't
>>supply much current. I will attempt this on another battery to see if
>>it
>>reacts the same as the first battery. I will also try to reverse charge
>>for a longer time period, such as a full minute. Will post another
>>update on the experiment.
>>
>>
>>
>>
>>Gary McCartney
>>
>>McCartney Electronics
>>Guelph Ontario Canada
>>Est. 1984
>>email: gary (at) number63.ca
>>
>>
>>
>>
>>
>>
>>
>>Jim Shupe wrote:
>>
>>>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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>>
>>
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