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

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

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.

I've looked at this but haven't jumped in yet.

There's a DIY option HERE

or

a production item HERE

HTH

Neil

get an OPTIMATE charger they are very good

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

I was always told that when it's completely dead it's dead...

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Originally posted by Ninehigh
I was always told that when it's completely dead it's dead...

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