rparigoris
Joined: 24 Nov 2009
Posts: 780
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 Posted: Wed Aug 29, 2012 3:22 pm Post subject: Charger needed to revive 18 aH Lead Acid Batteries |
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Hi Group
I have a task to try and revive some 18 aH 12 volt sealed AGM batteries that weigh in at ~ 14.5 pounds.
The charger that was being used on them begins at a 3.5aH charger, then slows down a bit and peaks ~ 14.2/3 then goes to 13.7 float.
After a while, I don't know if from letting discharge too much or for too long, or the 3.5 aH is a bit too fast, but what happens is the batteries although they peak and go to float, they really don't take too much of a charge and have a very low capacity.
I have a 900mA Yuasa motorcycle charger, that does a little better.
Now what I did find works really well, is using the fool cheapest of cheap battery chargers I gave away with the 9aH batteries I sold on AeroElestric.
That charger is nothing more than a 500mA transformer that supplies a constant 500mA current, then the circuit just looks for 15.4/5 and turns off. Now mind you it can take not hours, but days to reach that magic 15.4/5 number, and some batteries can not be revived, but most can. Then I found that if I take two of these batteries and parallel them and let the poor 500mA charger reach 15.4/5, it gets about as good as it gets so far.
I think that the longer elevated voltage is perhaps desulfating??
I have a constant current 2 aH charger, and if I let it go much over 14.4 the batteries make a minor bubbling noise that I don't like too much and figure if I let it go it will begin venting? I let it go 2 hours but the 500mA charge brought back more capacity.
Sorry for the long winded explain, what I need:
I need a consistent source for a fairly inexpensive charger that can help revive these batteries.
I looked at Walmart, they have a 1.5 amp charger that peaks too low.
Any ideas?
Thanking you in advance
Ron Parigoris
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