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wasssup1990 Posted - Jun 02 2007 : 09:40:41 AM
I have a 12V 9AH Lead Acid Battery from a motorcycle that I am wanting to charge. The plates were sulphated pretty bad, but I seem to have cleared most of it away. Initially I put 30V across the terminals with my power supply and managed to get 100mA to go through it. Now the battery is maintaining 5V to 7V after a few hours of charge from a convential charger. The battery is not going any higher than 7V at rest after a few ours on that charger. Although I have got the battery voltage up to 12V after after giving it an overcharge with my powersupply; it leveled out to 5V over night. Do you have any smart ideas that could try to treat this puppy?
Thanks
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Aaron Cake Posted - Jun 03 2007 : 10:05:21 AM
Sulfation is a normal thing in a lead acid battery and basically non-reversable. There are a few tricks that can be applied to get a few more cycles out of the battery, but basically it's dead.

You can test the acid concentration with a battery hydrometer, available at most auto parts stores for a few dollars.
wasssup1990 Posted - Jun 02 2007 : 9:03:22 PM
Do you know a dirt cheap method of checking the acid concentration? Do you think a battery zapper would work in this case?
Thanks
Aaron Cake Posted - Jun 02 2007 : 10:42:07 AM
It's dead. Unless you removed the plates from the case, totally cleaned eveything and replaced the acid, it's likely that you have at least one shorted cell.

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