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My stubborn Sealed lead acid battery refuses to charge!? Answered

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Just the day before it was working perfectly fine! And all of the sudden it doesn't! Its about 10 Amps and i was planning to use it but know it wont charge. Its about 2 times wider than those batteries that alarms use(look in that big box in the wall there is a lead acid battery in there) in my case i had 2. Its kinda like the one in the picture,Except a bit taller

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welder guy (author)2009-08-03

i bought a camera from a neighbor and it had two SLA batteries (dead). i decided to take one apart to try a new project and found out why i thaught they werent working. upon opening the battery fully i discoved a greenish / white powder on my chem gloves. i belived that this was the lead acid so to test it i put a tad on my arm and found out good news. it was the lead acid because it burnt like hell like i had read it would. after washing of my arm i decided that the whole thing was stupid and now a breathing hazard because it wasnt a paste anymore like i thaught it used to be when they where new. i ended up buring it in my backyard. so all i could think was that you need to put water in it to let current flow through it and thus charge it.

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ReCreate (author)welder guy2009-08-03

Thanks, I am Warned now to never take an Lead acid battery apart >_

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Sparkington (author)2009-01-29

Well simple put your battery is dead and need a new one. There are circuits out on the web called battery zapper, which can zap your battery back to life.

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Plasmana (author)Sparkington2009-01-29

The battery zappers don't seem to work for me... It is probably they don't have enough charge to properly zap the battery.

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12V (author)Plasmana2009-06-08

use a desulfator (a circuit that pulses 50v at 1khz)or make one!

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Plasmana (author)12V2009-06-13
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12V (author)Plasmana2009-06-14

that is exactly what i am making. i bought everything from digi-key and it came 2days later - i was expecting it to be 2 weeks!(uk).

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Plasmana (author)12V2009-06-15

Cool, that happens to me sometimes... :-D

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Sparkington (author)Plasmana2009-01-29

Maybe your battery is beyond zapping. I know this battery are dear. The only way to fix it the problem is to buy a new battery. Also to buy a decant battery charger design to charge seal lead acid battery.

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ReCreate (author)Sparkington2009-01-29

Also do zappers work for lead acid batts? I thought it was for NI-CD

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Sparkington (author)ReCreate2009-01-29

No you can get zapper for seal lead acid batteries, are you sure it a seal lead acid battery. If it a seal lead battery then you do not need add water, due it being sealed.

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Sparkington (author)ReCreate2009-01-29

lol I have never had to refill a seal lead acid battery before and I didn't knew it was even possible.

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ReCreate (author)Sparkington2009-01-29

so is that what i gotta do?

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Sparkington (author)ReCreate2009-01-29

Maybe like I said I never refill a seal acid battery, if it didn't work for me I always got a new one.

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ReCreate (author)Sparkington2009-01-29

When i shake the battery i hear some rattling inside does that mean i need to add water?

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Plasmana (author)2009-01-29

I have that same problem... :-(

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ReCreate (author)2009-01-29

Also my battery was from a dead UPS

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