sci.electronics.repair@googlegroups.com

Google Groups

Aoli <Aoli@Aoli.com>: Jan 04 11:51AM -0800 Battery rejuvenate   I have several 12V Gel cell batteries that came out of UPS units.   They all test at around 2 Volts.   I removed the cell caps and added distilled water.   My charger refuses to try to charge.   What can be done ? What charger might be needed ?   Steps by step please.   I have seen videos on youtube but I am looking for folks with real experience so that I might be successful.   Thanks you.

mjb@signal11.invalid (Mike): Jan 04 08:36PM >They all test at around 2 Volts. >I removed the cell caps and added distilled water. >My charger refuses to try to charge.   Bluntly :-   At 2 volts, and "removed from a UPS" they were probably already dead (overcharging, end of life) before they were killed again by leaving them discharged at such a ridiculously low voltage.   Your charger is a smart charger. Be smart. Take the hint. :)   >What can be done ?   Know anyone that needs some ballast?   >I have seen videos on youtube but I am looking for folks with real >experience so that I might be successful.   Whenever I've had a "12v" battery fail like that, it's dropped to "10v" then "8V" then "6v" ... as one by one the cells die. They don't come back. No amount of injecting distilled water, or other popular "remedies" often more suited to flooded cells (including off the wall ideas like adding various alkalis ...) do much good.   Any fixes are low-reliability, short-duration, and not something to rely on. Ultimately, you'll find the cells bulging out of their case ... just scrap (recycle) them. -- --------------------------------------+------------------------------------ Mike Brown: mjb[-at-]signal11.org.uk | http://www.signal11.org.uk

KenW <ken1943@invalid.net>: Jan 04 02:09PM -0700 >I have seen videos on youtube but I am looking for folks with real >experience so that I might be successful.   >Thanks you.   Water ? Your kidding right ?     KenW

danny burstein <dannyb@panix.com>: Jan 04 09:32PM [snip]     >>My charger refuses to try to charge.   >>What can be done ? >>What charger might be needed ?   If, and that's a pretty big and unlikely if, the batteries can be restored to anything useful, you've got to try charging them up first.   Yeah, you hooked up a charger, but many of them are "smart units" that analyze the load (the battery)'s electrical characteristics to determine how much current to send across.   Since your batteries are dead, dead, dead (so to speak) with only 2 volts (probably less..), the chargers refuse to send any current across.   So... you've got to set up a "dumb" charger.   If you don't have one around, there are two simple ways to try:   a: find an old phone or similar wall wart charging block rated at 12V DC . Attach the wires to the battery and leave it on for ten hours.   Then measure again and try the smart charger.   b: use jumper cables from a known _good_ and _charged_ battery to feed the dead one. Then measure again, etc.   I've done this exact same procedure with, yes, dead UPS units.   In about 1/2 of the batteries I've been able to get them back up to some useful level of charge.   Note by "useful" I mean a fraction of the original, as I'm using these UPS'es for:   1: to filter out the 1/2 second glitches that would otherwise reset my tv and cable modem, requiring fifteen minutes (GRUMBLE!!) to come back up [a],   2: to give enough time to shut down whatever they're hooked to.   Every so often I get one that does, indeed, get close enough to original spec...   [a] plenty of those when, for example, a grid area 15 miles away goes dark or is turned back on...     -- _____________________________________________________ Knowledge may be power, but communications is the key dannyb@panix.com [to foil spammers, my address has been double rot-13 encoded]

Ralph Mowery <rmowery42@charter.net>: Jan 04 05:12PM -0500 In article <sr2edo$ev8$1@reader1.panix.com>, dannyb@panix.com says...   > So... you've got to set up a "dumb" charger.   > If you don't have one around, there are two > simple ways to try:   I let a car sit too long with out starting and the battery was 'dead'. Smart charger would not charge it. Hooked up a dumb charger for a while and then the smart charger would work.

Michael Trew <michael.trew@att.net>: Jan 04 11:46PM -0500 On 1/4/2022 14:51, Aoli wrote:   > I have seen videos on youtube but I am looking for folks with real > experience so that I might be successful.   > Thanks you.   You're likely SOL on those batteries.   I have an old-school heavy duty 6/12/24V car battery charger. I'd hook that monster up to those batteries on full blast as a last resort, and just bake them. Don't over-bake, check the gauge. Worth a shot, I guess.

"Peter W." <peterwieck33@gmail.com>: Jan 05 07:01AM -0800 > I have an old-school heavy duty 6/12/24V car battery charger. I'd hook > that monster up to those batteries on full blast as a last resort, and > just bake them. Don't over-bake, check the gauge. Worth a shot, I guess.   Well, there is all that. But consider the amount of energy within any sort of lead-acid battery, even a gel-cell. With all that in mind, while 'worth a shot', be sure to:

"Peter W." <peterwieck33@gmail.com>: Jan 05 07:14AM -0800 > I have an old-school heavy duty 6/12/24V car battery charger. I'd hook > that monster up to those batteries on full blast as a last resort, and > just bake them. Don't over-bake, check the gauge. Worth a shot, I guess.   There is that. But, consider the amount of energy in any lead-acid battery, even one as 'slow' as a Gel-Cell. While 'worth a shot', be sure to:   a) Do it outside. Lots of hydrogen will be released if it works at all. b) Make sure that if anything lets loose (blows up), that the shrapnel will do no harm, or if it melts down, nothing will be damaged. c) Have the charger on a remote switch or some such so that one does not need to be standing nearby to turn it on or off - or, stand behind something. d) When finished with the process, give it time to cool down. e) All the while understanding that the actual chances of this working in any meaningful way are between slim and none.   https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcT3kxde5kwJ5uu_GKGiM-GKFjEYFLFhvqB_fA&usqp=CAU   Peter Wieck Melrose Park, PA

Michael Trew <michael.trew@att.net>: Jan 04 11:42PM -0500 On 1/2/2022 23:41, micky wrote: > Came with little stubs/buttons already labeled WOR etc., and they sat on > the 4 or 5" dial and would control where the dial stopped when you > turned it.)   Cross-posting to REC.ANTIQUES.RADIO+PHONO

Marvin Sherman <fawnaqzawlam@gmail.com>: Jan 04 06:56PM -0800 Fortunately, the long-term nature of SEO makes it a sound investment for any business. Even though it might seem like a long-term investment, it can help boost your revenues for years to come. By offering a gold- and silver-level package, an SEO agency can build a sustainable business. In the meantime, it can offer peripheral services, such as web design and social media management. You'll soon be generating consistent revenue, too.   While SEO is an essential tool in generating traffic, it's not profitable by itself. While it may increase your profits, it isn't a business strategy that is profitable. There's no doubt that Google's algorithms are constantly changing, and it isn't possible to predict what will happen in five years. For this reason, it is essential to make sure that you're maximizing the potential of SEO for your website.   A long-term strategy that produces consistent revenue is the best way to succeed with SEO. You can't afford to pay an SEO agency to do the work for you. It's not a business strategy. Instead, it's a business that has proven itself over time. With a steady stream of revenue, it's much more effective than the average website. It can also help you gain visibility, improve sales, and increase customer numbers. https://seo-mumbai.services/

Jeffery Malone <qutilaewtaui@gmail.com>: Jan 04 06:42PM -0800 Off-site optimizations include keyword research and competitive analysis. These efforts are crucial for a successful website and will increase your website's traffic to the top of search engines. Off-site optimizations are a great way to get your business recognized on search engines. In addition, you should integrate your SEO strategy with other online marketing tactics. If you're not sure where to start, you can hire an SEO agency. The agency will conduct a thorough analysis of your competition and use the information to determine the best keywords to target for your website.   Search engine optimization has become increasingly sophisticated in recent years, and SEO services are an integral part of an online marketing strategy. Off-site optimizations are a great way to get your website found in search engines. In addition to off-site optimizations, SEO should also be integrated with other online marketing tactics. Your company's website's success depends on these. Its visibility will depend on how well it can be indexed by search engines. https://seo-mumbai.services/

You received this digest because you're subscribed to updates for this group. You can change your settings on the group membership page. To unsubscribe from this group and stop receiving emails from it send an email to sci.electronics.repair+unsubscribe@googlegroups.com.