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Author Topic:   Battery Desulfator
Maximus posted 02-13-2011 08:38 PM ET (US)   Profile for Maximus   Send Email to Maximus  
Battery desulfator devices are on the market and claim to bring dead batteries back to life and rejuvenate tired batteries. The devices appear to be passive (not externally powered) and are connected between battery terminals. I have 2 AGM batteries (Optima Blue Tops) starting a fifth season this spring and wonder if this may help extend the life. Does anyone have real world experience with battery desulfators?
contender posted 02-13-2011 09:43 PM ET (US)     Profile for contender  Send Email to contender     
What is the cost of this battery rejuvenator? Do you have a dead battery to rejuvenate? Sounds like a scam, Batteries go dead because they wear out, then you trade them in, the companies break them apart for the lead, then make new batteries. If you are able to recharge the battery, how long will it hold the charge? Its still a 5 year old battery, I think after 5 years I would feel better with new batteries than a rejuvenated ones. For this reason, that is why I replace my batteries every two years, I purchase Walmart EverReady Marine, and take them back for an exchange and some cash. Good luck
jimh posted 02-13-2011 11:49 PM ET (US)     Profile for jimh  Send Email to jimh     
Does anyone have real world experience with battery desulfators?

I have no experience with a battery desulfator.

an86carrera posted 02-14-2011 06:23 AM ET (US)     Profile for an86carrera  Send Email to an86carrera     
The battery charger I use has that capability. I have tried it a few times to no avail. After waiting the 24 hours it takes to cycle thru the process with the unit I have, I always been disappointed.

So, in my opinion they do not work.


jimh posted 02-14-2011 08:38 AM ET (US)     Profile for jimh  Send Email to jimh     
The devices appear to be passive (not externally powered) and are connected between battery terminals.

I cannot imagine that any passive device could perform any useful work on a battery except to discharge it. On this basis, I cannot find any reasonable basis to accept the claims made.

Jefecinco posted 02-14-2011 10:03 AM ET (US)     Profile for Jefecinco  Send Email to Jefecinco     

For what it's worth I got good service from Optima Blue Tops for over eight years and they were going strong when I sold the boat last year.

As you have dual batteries it is fairly low risk to use them until one fails at which point you could replace both assuming the second Optima is not far behind the first and will fail soon. It is also a good idea to have closely matched batteries on your dual set up.

Because the Optimas are now manufactured in China and I have heard of some early failures of the China batteries I have switched to Sears AGMs on the new boat.


an86carrera posted 02-14-2011 10:15 AM ET (US)     Profile for an86carrera  Send Email to an86carrera     
Mine does not seem to be passive. I can hear the unit doing some kind of work by cycling on and off during this process. Not being too astute in things electronic, I thought is was hitting it with reversed voltage to desulfate? Is that possible?


number9 posted 02-14-2011 11:49 AM ET (US)     Profile for number9  Send Email to number9     
Found a link to a similar device which includes the Patent #7374839.

Possible Jim or another electrical/electronics type could read up on the patent and give their opinion.

A bit pricey at $130 unless it works and you have many batteries. But simple instructions.

jimh posted 02-15-2011 04:43 PM ET (US)     Profile for jimh  Send Email to jimh     
If the device being discussed contains internal electronic circuitry, you cannot say it is "passive."

If there is no external power applied to the battery, the net effect of operating the device has to be a discharge of the battery. The device cannot consume electrical power and yet somehow not draw power from the battery. The power that operates the device must come from the battery, and unless the circuitry is really something special, it cannot create more power than it consumes. So the net effect is to discharge the battery.

64nauset posted 02-22-2011 10:01 AM ET (US)     Profile for 64nauset  Send Email to 64nauset     
I have about 10 years experience with a de-sulphator by: . I think it works, and I continue to use it. Batteries on the sailboat are seven years old. Optimas by the way.

I think for the idea to work, de-sulphating should take place on a continuing basis, not just at charging. There were two styles at the time of purchase, one solar powered, one powered by the battery itself. I have the latter. They cost around $40 a copy, though I haven't priced them lately. If using the battery powered one, it is necessary to charge the batteries more often in the off season, maybe once in three months seems enough.

Here's a different brand: SubCategoryID=86&SubCategory=Chargers,%20Desulphators& Category=Electrical

Pulsetech claims the military uses their gadgets extensively. I haven't checked with the Army to confirm this.

As Chuck Husick was fond of saying, "Batteries don't die, owners kill them."

The Nauset batt is only two years old now, and I expect to get another five out of it.

----> bruce

jimh posted 02-22-2011 05:11 PM ET (US)     Profile for jimh  Send Email to jimh     
I would like to know the method of testing by which one determines that the use of a battery de-sulfator has caused the battery to have a longer useful life. If this method could be described, I would be pleased to learn how you do this test.
Mr T posted 02-22-2011 05:31 PM ET (US)     Profile for Mr T  Send Email to Mr T     
I am in that same camp; I have a battery I suspect that I would like to know if it is suffering from sulfation.

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