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Re: (ET) 12 Volt batteries!
Tim,
Thank you for this info. I brought a meter in to work today and the
batts all read 11.7vdc. Looks like they are keepers.
Thanks,
Bob
-----Original Message-----
From: elec-trak-bounces cosmos phy tufts edu
[mailto:elec-trak-bounces cosmos phy tufts edu] On Behalf Of Tim
Humphrey
Sent: Tuesday, March 20, 2007 8:55 AM
To: elec-trak cosmos phy tufts edu
Subject: Re: (ET) 12 Volt batteries!
Here's my experience with new never used 6+ yr old batteries.
These were Hawker Genesis batt's, I could reasonably expect any other
brand to not fair as well as these...
I received them in their unopened factory shipping boxes, they are all
at
least 6 yrs old.
If the open circuit voltage read 11 or better, I had a 99% success rate
just plugging them into a Schumacher SpeedCharge charger
http://store.schumachermart.com/sc-1200a.html (bought at Wal-mart). One
note though, they don't sit at 12.80 like Hawker says they should, they
rest at
more like 12.69-12.74. BUT!! I haven't cycled them, just charged them,
with a little exercise I expect them to increase.
Open circuit voltages of 8.5 - 11 were about a 65% success rate.
Below 8.5 was about 10%.
The batteries below 11v were put on the charge scheme that David
pointed
out, up to 80 volts through a headlight, until the current started to
rise, then the light was removed and the V reduced to 14.7 - 15
manually kept
constant (I used the Mil Surplus charger, commonly referred to amongst
EV
and ET'rs as a Fair Radio charger) until the current started to drop,
then
it was placed on the Schumacher..
Dead batteries here in NY are good for an $8.00 core charge. So if they
were free and not usable, they'd still be worth 8 bux.
I'd go get 'em.
Stay Charged!
Hump
I-5, Blossvale NY
>
>
>
> -----Original Message-----
> From: elec-trak-bounces cosmos phy tufts edu
> [mailto:elec-trak-bounces cosmos phy tufts edu] On Behalf Of David
Roden
> Sent: Monday, March 19, 2007 10:55 PM
> To: elec-trak cosmos phy tufts edu
> Subject: Re: (ET) 12 Volt batteries!
>
> On 19 Mar 2007 at 16:28, Kleinbrahm, Robert wrote:
>
>> Does anyone know the shelf life of large AGM type batteries.
>
> They're like any lead battery - if they self-discharge and are left
> discharged, they'll become sulfated. There's no cure for that.
>
> The good news is that most AGMs have appreciably lower self discharge
than
> flooded or gel batteries. Six years is a prettly long time, but as a
wild
> guess, I'd say they have a 30-50% chance of retaining enough capacity
to
> make them useful for light duty use.
>
> They'll most likely be dead flat or nearly so. To try to bring them
back,
> you'll need a moderately high voltage power supply. Connect an
automotive
> taillight in series as a current limiter and crank up the voltage
until
> you
> see a little current flowing. If you're lucky, after something
between
> several hours and several days, the current will start to increase.
Then
> you can start turning the voltage down. Once they get a bit of a
charge
> on
> them, you can switch over to a real charger.
>
> If someone offered them to me for nothing, I'd take them. I wouldn't
pay
> anything for them, though. Hey, if nothing else, they could be useful
as
> ballast in the ET weight box.
>
> David Roden - Akron, Ohio, USA
>
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