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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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Revive Gel Battery?
Inherited an Uninterruptible Power Supply (UPS) that was unused for a while so the gel battery is fully discharged.
Do not want to purchase a new gel battery so am interested in trying to revive it. Did a search and found Battery Life Saver Patent #7374839 http://batterylifesaver.com/how-do-i...-dead-battery/ Patent PDF http://www.freepatentsonline.com/7374839.pdf found discussion of Battery Life Saver http://www.rvforum.net/SMF_forum/ind...?topic=22055.0 Am interested in any experience others have had in reviving gel batteries either using Battery Life Saver or any other technique. Ken |
#2
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Revive Gel Battery?
On 11/30/2012 7:32 AM, KenO wrote:
Inherited an Uninterruptible Power Supply (UPS) that was unused for a while so the gel battery is fully discharged. Do not want to purchase a new gel battery so am interested in trying to revive it. Did a search and found Battery Life Saver Patent #7374839 http://batterylifesaver.com/how-do-i...-dead-battery/ Patent PDF http://www.freepatentsonline.com/7374839.pdf found discussion of Battery Life Saver http://www.rvforum.net/SMF_forum/ind...?topic=22055.0 Am interested in any experience others have had in reviving gel batteries either using Battery Life Saver or any other technique. Ken I built a computer controlled charger/discharger. And I have a pulse generator that can put out an amp or 50V. I've done considerable experimentation with recovering many different battery technologies. Bottom line: Give it up. While I believe that a pulse charger/desulfator can help prevent deterioration on a good battery that's rarely used...boat...RV, Once the battery has been dead for a long time, it ain't coming back. A UPS is one of the most stressful applications for a battery. A tiny amount of series resistance will render it useless in that application. My UPS battery isn't completely dead, but it can keep my system up for 15 seconds or so. Since the typical outage is less than a second, it's not worth replacing the battery. Outages longer than a second are likely to be longer than any ups can handle. But might give you a chance to shut down the system gracefully. For most of us, a UPS is overrated. If you really need it, spring for a new battery. If not, send it to recycle. |
#3
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Revive Gel Battery?
Mike,
Thanks for your comments. Since posting have been reading reviving battery posts on other forums and most are similar to yours. Ken |
#4
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Revive Gel Battery?
Mike,
"I've done considerable experimentation with recovering many different battery technologies....While I believe that a pulse charger/desulfator can help prevent deterioration on a good battery that's rarely used...boat...RV,Once the battery has been dead for a long time, it ain't coming back..." Have you posted your experiments? Am especially interested in "pulse charger/desulfator can help prevent deterioration on a good battery that's rarely used" Thanks again for your comments! Ken |
#5
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Revive Gel Battery?
KenO wrote:
Inherited an Uninterruptible Power Supply (UPS) that was unused for a while so the gel battery is fully discharged. Do not want to purchase a new gel battery so am interested in trying to revive it. Did a search and found Battery Life Saver Patent #7374839 http://batterylifesaver.com/how-do-i...-dead-battery/ Patent PDF http://www.freepatentsonline.com/7374839.pdf found discussion of Battery Life Saver http://www.rvforum.net/SMF_forum/ind...?topic=22055.0 Am interested in any experience others have had in reviving gel batteries either using Battery Life Saver or any other technique. I'd search for a source of re-cycled used batteries. Many users recycle them after some # of years, and the batteries are still usable in many cases. I've goten several usable ones at a local metal recycle center that happens to be good about selling cheap batteries they've taken in. |
#6
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Revive Gel Battery?
On 11/30/2012 10:01 AM, KenO wrote:
Mike, "I've done considerable experimentation with recovering many different battery technologies....While I believe that a pulse charger/desulfator can help prevent deterioration on a good battery that's rarely used...boat...RV,Once the battery has been dead for a long time, it ain't coming back..." Have you posted your experiments? Am especially interested in "pulse charger/desulfator can help prevent deterioration on a good battery that's rarely used" There's lots written on the subject, mostly by people who want to sell you something. I don't think there's any consensus on what works. The consensus seems to be that none of them work. I don't understand the chemistry, but it appears that the sulphate forms an insulating layer on the plate surface. Once it's there, it's hard to get removed. But if you don't let it form, it's not a problem. Pulse charging gives you that peak current to keep the thing charged without boiling away the electrolyte. Thanks again for your comments! Ken |
#7
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Revive Gel Battery?
On 11/30/2012 10:32 AM, Bob F wrote:
KenO wrote: Inherited an Uninterruptible Power Supply (UPS) that was unused for a while so the gel battery is fully discharged. Do not want to purchase a new gel battery so am interested in trying to revive it. Did a search and found Battery Life Saver Patent #7374839 http://batterylifesaver.com/how-do-i...-dead-battery/ Patent PDF http://www.freepatentsonline.com/7374839.pdf found discussion of Battery Life Saver http://www.rvforum.net/SMF_forum/ind...?topic=22055.0 Am interested in any experience others have had in reviving gel batteries either using Battery Life Saver or any other technique. I'd search for a source of re-cycled used batteries. Many users recycle them after some # of years, and the batteries are still usable in many cases. I've goten several usable ones at a local metal recycle center that happens to be good about selling cheap batteries they've taken in. Hospitals are required to change batteries in life-saving equipment on a regular schedule. That seeks to make sure the stuff works when it's needed. People who work for hospitals take them out of the dumpster and to swapmeets. I've NEVER bought one that was worth a damn. For low drain apps, maybe they work ok. For high drain apps like a UPS, they've been universally unsuitable. You might have better luck if you get closer to the source. By the time they get to a swapmeet, they've been cherry-picked multiple times. If you've got a standard 7AH 12V battery, just go spend $20 and be done with it. It's not worth the hassle. But do buy one from a high volume dealer. One that's been sittin' on the shelf for two years is not what you want. And if you buy off EBAY, you never know what you'll get. |
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