coozer
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| posted on 13/6/09 at 01:12 PM |
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Battery Recovery?
Is it possible to recover a dead battery? I have the one off the donor thats been standing nearly 3 years another off the Zook thats probably been
standing 4.
Is it possible to replace the electrolyte and get them back?
Steve
1972 V8 Jago
1980 Z750
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Guinness
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| posted on 13/6/09 at 01:22 PM |
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It depends if the plates have warped.
I left a Sierra battery outside for a few years during the build. Topped up the fluid and stuck it on the charger and it came back to life.
I left a bike battery out last winter and it died. Connected it to the "inteligent" charger, and it seemed to take a charge, the light
changed from red to green. It would come off charge, start the car, but then it wouldn't start it again if left standing, or overnight.
Mike
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SteveWalker
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| posted on 13/6/09 at 02:37 PM |
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If it is recoverable, you may find that modern "intelligent" chargers decide that it is shot and refuse to charge it. Try charging for a
while with an old fashioned "dumb" charger first.
For a one off it's not really worth going any further than this, but there are circuits that you can build that repeatedly store up a small
charge and then zap a pulse of around 250V into the battery, supposedly destroying deposits that stop the battery recharging.
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trikerneil
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| posted on 13/6/09 at 04:10 PM |
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I've looked at this but haven't jumped in yet.
There's a DIY option HERE
or
a production item HERE
HTH
Neil
ACE Cafe - Just say No.
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s2gse
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| posted on 13/6/09 at 07:27 PM |
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get an OPTIMATE charger they are very good
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Daddylonglegs
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| posted on 13/6/09 at 08:34 PM |
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As ^^^
Mate of mine had a battey that would start the car after a charge but would not start again in the morning. He bought an OPTIMATE and it brought it
back to life. Apparently, it charges at over 20V for a while which blows the crap of the plates and allows normal action and recharge.
HTH
JB
It looks like the Midget is winning at the moment......
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Ninehigh
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| posted on 15/6/09 at 10:25 PM |
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I was always told that when it's completely dead it's dead...
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MikeRJ
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| posted on 16/6/09 at 07:33 AM |
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quote:
Originally posted by Ninehigh
I was always told that when it's completely dead it's dead...
Pretty much yes. The plates sulfate if left to go completely flat, and it's not an easily reversible reaction.
IME even if you do get it to accept a charge, it will never be a "good" battery again i.e. it will have low capacity and poor cranking
current.
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