Re: Are batteries that won't hold charge salvageable?

Posted by chas on December 19, 2009 at 13:18:22 from (82.33.130.191):

In Reply to: Re: Are batteries that won't hold charge salvageable? posted by Walterdavies on December 19, 2009 at 12:47:30:

Depends how old, how bad. 5 years is a good life for a battery with moderate work load. If the plates are just "Hardened" it can be recoverable if they are heavily sulphated, probably not. Like Walt says, charge for UP TO 24hrs at 5A or so with the tops LOOSE to let out the gas but not the splashes, check regularly, see if you can hear or see it "fizzing" enthusiastically, if so that"s it charged. See what happens then. See if it"s the same on all cells. DONT get your eyes in the way of splashes goes without saying. If it looks not too bad and you want to go for a bit of reconditioning, empty out, flush with water (Distilled/de-ionised NOT tap)get rid of any sludge ( that can be shorting the plates at the bottom of the cells). Refill with sulphuric acid at about 1250/1280 SG. Recharge till it fizzes. If you have/can get a hydrometer, a charged reading of 1250 or better is what you are looking for. Usual health & safety warnings. Hydrogen gas is what is fizzing, makes some good bangs !

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