[TechAssist] Re: Any way to revitalize dead sealed lead acid batteries?
- From: Edward Gaidies <teltek3@xxxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Sat, 28 Aug 2004 20:58:30 -0400
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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