Sealed Lead Acid batteries

[Terry Dawson]

I have a number of 12V 7Ah SLA batteries sourced from various places over the years.

None of them have been regularly used and some of them present an Open Circuit (or very close to it) when connected to a charger.

Are they salvageable or do I send them off for recycling?

regards

Terry

[Jason Ball]

I have read about some high voltage circuits to zap old batteries in the hope of desulphsting the plates .

No idea if it works, or how well in afraid.

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[Jason Ball]

I have read about some high voltage circuits to zap old batteries in the hope of desulphsting the plates .

No idea if it works, or how well in afraid.

On Tuesday, 30 April 2013, Terry Dawson wrote:

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[Kean Maizels]

I’ve tried various techniques, and had almost no success.

The little bit of success (if you could actually call it that) has not been worth the time & effort.

 

Some good info on the Battery University website – e.g.

http://batteryuniversity.com/learn/article/sulfation_and_how_to_prevent_it/

 

Kean

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[tALSit de CoD]

I read this just yesterday, I don't know if it's of any help though:

http://www.neufeld.newton.ks.us/electronics/?p=1574

// talsit.org

[Kean Maizels]

Oh, yes.  I remember reading that quite some time ago, and thinking it might be worth trying on SLA batteries where one cell seems to be bad.  i.e. where there is still 9V+, but wont supply more than 100mA.  I have some of those.

 

Trying it now.  Bench DMM, PC controlled electronic load, and PSU all configured.  Thanks for the reminder talsit

 

Not sure it will help a battery where the voltage has been left to drop way below 10V.  If I have one around, I’ll try it too.

 

Kean

[Terry Dawson]

Thanks Guys,

Armed with your information I'm not going to bother with these batteries, they're almost certainly dead to the point of being not worth the effort. They're ex-UPS batteries and have been sitting on a shelf, completely flat for literally years. I'll recycle them.

regards

Terry