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Author Topic: Reconditioning of a Lead Acid Battery  (Read 38760 times)

Offline Hitman

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Reconditioning of a Lead Acid Battery
« on: May 22, 2012, 01:24:00 PM »
Hello all,
I recently had to remove a couple of batteries form my solar battery bank cause they would no longer hold a charge, voltage gets to 14.5 volts but quickly drops to 10 volts when disconnected from the solar charger. I paid over 200$ each for these batteries and it breaks my heart to throw them away so I decided to try and recondition them using Epsom salt.

I removed the acid and replaced it with an epsom salt and distilled water solution, once filled I took a voltage reading and to my surprize the battery read 11.56 volts without being charged. I then charged it to 14.5 volts, let it rest for an hour then connected to my CBA (computer battery anaylizer), start voltage was 13volts and 1 amp current draw.

After 20 hours of discharging the battery, it still did not drop under 11 volts. I will continue monitoring the charge discharge cycles and record my results but so far this seems to be a winner.

Cheers Hitman
 

Offline Romero

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Re: Reconditioning of a Lead Acid Battery
« Reply #1 on: May 22, 2012, 02:36:15 PM »
@Hitman
Can you tell me how much salt for one liter of distilled water?
I have lots of old batteries that I can try it too.

Regards,
Romero


Offline Hitman

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Re: Reconditioning of a Lead Acid Battery
« Reply #2 on: May 22, 2012, 07:57:36 PM »
450g of magesium sulfate (epsom salt) in 2 liters of distilled water.
If you need the exact procedure I posted it here:

http://www.itawk.com/?blog=2012/9/reconditioning_of_a_lead_acid_battery

I'm really impressed with it so far and I'm doing another discharge run today but at about 5amps, don't think i'll have to wait 20 hours again but it would be nice.

Cheers Hitman
« Last Edit: November 05, 2012, 05:00:05 PM by Hitman »

Offline Romero

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Re: Reconditioning of a Lead Acid Battery
« Reply #3 on: May 22, 2012, 11:06:46 PM »
450g of magesium sulfate (epsom salt) in 2 liters of distilled water.
If you need the exact procedure I posted it here:

http://w2.itawk.com:8080/?action=trackback&value=15

if you cant access port 8080 just let me know and I'll post the entire method I used, I'm really impressed with it so far and I'm doing another discharge run today but at about 5amps, don't think i'll have to wait 20 hours again but it would be nice.

Cheers Hitman
Thank you, I will try it too but first I need to get some epsom salt.

Regards,
Romero

Offline crazycut06

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Re: Reconditioning of a Lead Acid Battery
« Reply #4 on: May 23, 2012, 05:01:53 PM »
Hi Hitman,
    How much voltage should be left when discharging a battery, before I recharge it again?

   

Offline Hitman

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Re: Reconditioning of a Lead Acid Battery
« Reply #5 on: May 23, 2012, 09:54:21 PM »
I depends the type of battery, example a car battery should not go below 12 volts but if your using a golf cart battery you can go down to 10.6 volts and deep cycle are at about 11.5 I think. The battery I'm testing at the moment is an Excide Marine deep cycle not sure of the amp hrs it has, it was salvaged from the trash along with another much bigger one.

Cheers Hitman

Offline crazycut06

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Re: Reconditioning of a Lead Acid Battery
« Reply #6 on: May 24, 2012, 04:41:07 PM »
Oops! I thought we need to drain it all  ;D my battery is a sealed type car battery.

Offline Hitman

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Re: Reconditioning of a Lead Acid Battery
« Reply #7 on: May 25, 2012, 02:36:00 AM »
Alright here are the results for the first three charge/discharge cycles, the third run didn't look very good. I will continue a few more cycles and if there is no change I will try a radient charge.

I'm not sure yet but I think this turned my battery into a big alkaline cell, only time will tell.

Cheers Hitman

Offline Hitman

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Re: Reconditioning of a Lead Acid Battery
« Reply #8 on: June 01, 2012, 04:18:30 PM »
After multiple charge discharge cycles my battery was no longer holding a charge again and the only way to bring it back up was to replace the salt solution in the battery, so as I suspected we are only turning the battery into a big non rechargeable cell.

I've also started the same procedure on another battery but using radient energy to recharge and so far things don't look good.

Cheers Hitman

Offline Romero

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Re: Reconditioning of a Lead Acid Battery
« Reply #9 on: June 01, 2012, 08:26:25 PM »
After multiple charge discharge cycles my battery was no longer holding a charge again and the only way to bring it back up was to replace the salt solution in the battery, so as I suspected we are only turning the battery into a big non rechargeable cell.

I've also started the same procedure on another battery but using radient energy to recharge and so far things don't look good.

Cheers Hitman
Other mixtures should be tested, I am sure there must be something better than the existing solution.

Romero

Offline Wings

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Re: Reconditioning of a Lead Acid Battery
« Reply #10 on: June 01, 2012, 10:39:26 PM »
After multiple charge discharge cycles my battery was no longer holding a charge again and the only way to bring it back up was to replace the salt solution in the battery, so as I suspected we are only turning the battery into a big non rechargeable cell.

I've also started the same procedure on another battery but using radient energy to recharge and so far things don't look good.

Cheers Hitman

after cleaning with the salts have restored the content with distilled water and 6 moles of sulfuric acid?

http://ecee.colorado.edu/~ecen4517/materials/Battery.pdf


Offline Hitman

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Re: Reconditioning of a Lead Acid Battery
« Reply #11 on: June 02, 2012, 08:17:38 PM »
After multiple charge discharge cycles my battery was no longer holding a charge again and the only way to bring it back up was to replace the salt solution in the battery, so as I suspected we are only turning the battery into a big non rechargeable cell.

I've also started the same procedure on another battery but using radient energy to recharge and so far things don't look good.

Cheers Hitman

after cleaning with the salts have restored the content with distilled water and 6 moles of sulfuric acid?

http://ecee.colorado.edu/~ecen4517/materials/Battery.pdf

OK so now you want me to remove the salt solution and replace with distilled water and sulfuric acid correct ?

Cheers Hitman

Offline Wings

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Re: Reconditioning of a Lead Acid Battery
« Reply #12 on: June 04, 2012, 08:39:43 AM »
After multiple charge discharge cycles my battery was no longer holding a charge again and the only way to bring it back up was to replace the salt solution in the battery, so as I suspected we are only turning the battery into a big non rechargeable cell.

I've also started the same procedure on another battery but using radient energy to recharge and so far things don't look good.

Cheers Hitman

after cleaning with the salts have restored the content with distilled water and 6 moles of sulfuric acid?

http://ecee.colorado.edu/~ecen4517/materials/Battery.pdf

OK so now you want me to remove the salt solution and replace with distilled water and sulfuric acid correct ?

Cheers Hitman

check

"With the mixture in the battery, and the battery fully charged specific gravity should be 1.650 to
1.850 in summer and up to 1.300 in winter. If the reading is too low add more acid."

http://homepages.ihug.co.nz/~pcaffell/Battery_Maintanence_Tips.pdf

http://en.wikipedia.org/wiki/Lead%E2%80%93acid_battery

Offline Hitman

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Re: Reconditioning of a Lead Acid Battery
« Reply #13 on: June 05, 2012, 07:43:50 PM »
@wings

Thank you I will try it.

Cheers Hitman


 

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