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Author Topic: Reconditioning 12V Batteries  (Read 8190 times)


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Reconditioning 12V Batteries
« on: September 08, 2010, 09:27:51 AM »
        Restoring Batteries:

        FIRST THING IS YOU MUST BE CAREFUL!!! Battery acid can burn you!!!!! You’ll need Rubber gloves and eye protection!!!! No exceptions!!!

        Things needed:

        Rubber gloves

        Eye Protection

        Baking soda

        EDTA (most health food stores carry this)

        Distilled Water

        Battery Charger or solar panel


        Battery acid (most auto parts stores will have this)

        First remove the old battery acid from the battery by pouring the acid into a plastic bucket that has 1 cup of baking soda in it. Then fill the battery with distilled water, close the caps and give it a good shake. Then pour the contents of the battery in to the bucket.

        Now your ready to chelate the battery. Mix one tablespoon of EDTA (can be had from any good health food store – open the capsules if that’s the only way you can get it) into one gallon of distilled water, then fill the battery with the solution.

        Now you’re ready to put the battery on a slow, 24 hour charge. With the overnight charging done, check the battery voltage. If the battery does not come up to 12.5 volts at this point, putting the new battery acid in to the battery is a waist of time. If this is the case, the battery is beyond saving. If it does come up to 12.5 volts, empty the contents of the battery in to the bucket and replace it with battery acid. Then give it another 24 hour slow charge.

        My track record for doing this is 9 came up to spec and one did not.

        You’ll notice that most car repair shops have a place where they put old "dead" batteries. These are worth $8 each to them for a core charge.

        Let’s say you buy 10 of these dead batteries and pay $8 each for them.

            Cost of distilled water $1 per battery

            Cost of Battery acid $2 per battery

            Cost of EDTA $10 for a few dozen batteries

            Total Cost for 10 batteries and supplies $84

        Recondition 10 and get 8 up to spec and your cost per battery is around $10, not $75.


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Re: Reconditioning 12V Batteries
« Reply #1 on: November 13, 2010, 02:52:26 AM »
Hey, that was good info!  :D  I'll be doing this for my next Battery replacement.


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Re: Reconditioning 12V Batteries
« Reply #2 on: November 13, 2010, 06:49:04 AM »
 Thanks for the battery info... I have always wondered what the used battery sellers were doing to fix batteries. 
I would however like to suggest a test beyond the voltage test. In the automotive industry, a load test is also performed. The reason is that many times the voltage will be correct, but voltage falls rapidy when loaded.  I know we won't be using car starting systems , but we will likely use power inverters.  A battery with good voltage,but failed a load test ,may not be adequate to power anything used which draws a lot of current, such as a microwave. It is my belief that a voltage test alone may be adequate for low draw usage such as 12 volt lights.
Inexpensive battery load testers can be purchased at Harbor Freight for less than $20.00.


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