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Re: replacement battery questions [message #323428 is a reply to message #323380]

Tue, 05 September 2017 23:12

Ken Burton

Messages: 10030
Registered: January 2004
Location: Hebron, Indiana

Karma:

Senior Member

kingd wrote on Tue, 05 September 2017 09:33

Ken Burton, would you mind sharing your process for "restoring" an old discharged battery ?
Inquiring minds would like to know.

It is a secret and if I tell you then everyone will know.

Actually, all I usually do is put a slow charge into them and check them at least every 24 hours. Once they start drawing current, depending on the size, I usually keep the charge level below 4 amps. Sometimes it takes several days for one to start taking a charge. The key is to keep the charge rate low for a long time.

The one that I was working on is at least 18 years old and it now sitting at 12.59 volts. I will eventually also put a load tester on it. I have hooked it up to the coach on the engine side and it appears to take various loads just fine.

I found a second battery today installed in this same coach. It is what I think is an 8D of the same age. It fills the entire rear battery compartment. Tomorrow I will try to drag it out of there. I know it is to heavy for me to lift. The problem is the coach is parked against the wall and I do not have much room to work back there. I started charging it tonight on a slow charge. It was only drawing .3 amps. We will see if anything changes tomorrow. I really need to add water or at least check it before I go much farther. I had a battery filler in my garage at home. If I find it I may use that instead of pulling the battery. This one is going to take days at this rate.

If it has a dead cell the first thing to do is to use a de-sulfator. That is safe and that usually works.

I AM NOT RECOMMENDING THE FOLLOWING!

DO NOT DO THE FOLLOWING. I really have misgivings about posting this.

When the desulfator doesn't work I sometimes hit it with an arc welder VERY BRIEFLY about 1/4 second or less. THIS IS VERY DANGEROUS and can blow up in your face. I only do it after a battery has been allowed to vent with the caps removed for 24 hours or more. I set the battery outside and run the cables inside. I attach the cables to the battery and go back inside. Then I attach the cables to the hot welder set on the lowest setting for 1/4 to 1/2 second.

If that does not fix it I give up and scrap the battery.

The above is for information purposes only. Do NOT do it. I' m really worried that someone will blow one up in their face and blind themselves.

Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana

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[Message index]

		replacement battery questions By: Deb on Mon, 04 September 2017 11:55
		Re: replacement battery questions By: Ken Burton on Mon, 04 September 2017 12:07
		Re: replacement battery questions By: Ken Burton on Mon, 04 September 2017 12:15
		Re: replacement battery questions By: Deb on Mon, 04 September 2017 12:56
		Re: [GMCnet] replacement battery questions By: johnd01 on Mon, 04 September 2017 13:18
		Re: [GMCnet] replacement battery questions By: Ken Henderson on Mon, 04 September 2017 13:18
		Re: [GMCnet] replacement battery questions By: Deb on Mon, 04 September 2017 13:55
		Re: [GMCnet] replacement battery questions By: jimk on Mon, 04 September 2017 12:00
		Re: [GMCnet] replacement battery questions By: Deb on Mon, 04 September 2017 12:23
		Re: [GMCnet] replacement battery questions By: Hal StClair on Mon, 04 September 2017 12:54
		Re: [GMCnet] replacement battery questions By: Deb on Mon, 04 September 2017 12:58
		Re: [GMCnet] replacement battery questions By: Ken Burton on Tue, 05 September 2017 00:10
		Re: [GMCnet] replacement battery questions By: Bruce Hart on Tue, 05 September 2017 05:53
		Re: replacement battery questions By: JohnL455 on Mon, 04 September 2017 14:24
		Re: [GMCnet] replacement battery questions By: Bruce Hart on Mon, 04 September 2017 14:50
		Re: [GMCnet] replacement battery questions By: Deb on Mon, 04 September 2017 15:06
		Re: [GMCnet] replacement battery questions By: Don A on Mon, 04 September 2017 17:50
		Re: [GMCnet] replacement battery questions By: Don A on Mon, 04 September 2017 17:56
		Re: [GMCnet] replacement battery questions By: Deb on Mon, 04 September 2017 21:08
		Re: [GMCnet] replacement battery questions By: Deb on Mon, 04 September 2017 21:56
		Re: [GMCnet] replacement battery questions By: k2gkk on Mon, 04 September 2017 18:16
		Re: [GMCnet] replacement battery questions By: GMC Cruse on Mon, 04 September 2017 19:36
		Re: [GMCnet] replacement battery questions By: Deb on Mon, 04 September 2017 21:01
		Re: [GMCnet] replacement battery questions By: GMC Cruse on Tue, 05 September 2017 21:05
		Re: replacement battery questions By: Deb on Mon, 04 September 2017 15:05
		Re: replacement battery questions By: JohnL455 on Mon, 04 September 2017 17:49
		Re: replacement battery questions By: kingd on Mon, 04 September 2017 19:21
		Re: replacement battery questions By: Matt Colie on Mon, 04 September 2017 19:54
		Re: replacement battery questions By: Deb on Mon, 04 September 2017 20:54
		Re: replacement battery questions By: kingd on Mon, 04 September 2017 20:42
		Re: replacement battery questions By: kingd on Mon, 04 September 2017 21:05
		Re: replacement battery questions By: Matt Colie on Tue, 05 September 2017 08:07
		Re: replacement battery questions By: kingd on Tue, 05 September 2017 09:30
		Re: replacement battery questions By: Matt Colie on Tue, 05 September 2017 11:04
		Re: [GMCnet] replacement battery questions By: k2gkk on Tue, 05 September 2017 11:10
		Re: replacement battery questions By: kingd on Tue, 05 September 2017 09:33
		Re: replacement battery questions By: Ken Burton on Tue, 05 September 2017 23:12
		Re: replacement battery questions By: Matt Colie on Wed, 06 September 2017 08:49
		Re: replacement battery questions By: Justin Brady on Wed, 06 September 2017 10:39
		Re: replacement battery questions By: kingd on Wed, 06 September 2017 16:49
		Re: replacement battery questions By: Ken Burton on Wed, 06 September 2017 22:46
		Re: replacement battery questions By: Matt Colie on Thu, 07 September 2017 08:38
		Re: replacement battery questions By: Deb on Thu, 07 September 2017 13:08
		Re: [GMCnet] replacement battery questions By: Emery Stora on Thu, 07 September 2017 13:32
		Re: [GMCnet] replacement battery questions By: Deb on Thu, 07 September 2017 14:19
		Re: [GMCnet] replacement battery questions By: Cesar Carrasco on Thu, 07 September 2017 14:22
		Re: [GMCnet] replacement battery questions By: Ken Henderson on Thu, 07 September 2017 19:21
		Re: [GMCnet] replacement battery questions By: Ken Henderson on Thu, 07 September 2017 13:37
		Re: [GMCnet] replacement battery questions By: Deb on Thu, 07 September 2017 14:11
		Re: [GMCnet] replacement battery questions By: Matt Colie on Thu, 07 September 2017 14:55
		Re: [GMCnet] replacement battery questions By: Deb on Thu, 07 September 2017 18:39
		Re: replacement battery questions By: Ken Burton on Fri, 08 September 2017 10:44
		Re: replacement battery questions By: jhbridges on Fri, 08 September 2017 07:59

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