bringing almost dead batteries back to life

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   i managed to skip couple of car batteries around my area..
two had nice 12v on them when found, been sitting on a charger for a night and seem to hold the charge. 

another one was 4v voltage when found, managed to give it a full charge, but is going for experimental purposes :-) 
any ideas on bringing it back to life? (desluphator device, high voltage dc flashes, distilled water etc?
lots of info on the net not sure what works what is a con. 

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amlu Members Profile Send Private Message Find Members Posts Add to Buddy List Young Croc Joined: 30 November 2009 Location: london Status: Offline Points: 740	Post Options Post Reply Quote amlu Report Post Thanks(0) Quote Reply Topic: bringing almost dead batteries back to life Posted: 23 June 2013 at 7:24pm
	i managed to skip couple of car batteries around my area.. two had nice 12v on them when found, been sitting on a charger for a night and seem to hold the charge. another one was 4v voltage when found, managed to give it a full charge, but is going for experimental purposes :-) any ideas on bringing it back to life? (desluphator device, high voltage dc flashes, distilled water etc? lots of info on the net not sure what works what is a con.

Saturnus Members Profile Send Private Message Find Members Posts Add to Buddy List Old Croc Joined: 13 July 2010 Location: Copenhagen Status: Offline Points: 2025	Post Options Post Reply Quote Saturnus Report Post Thanks(0) Quote Reply Posted: 23 June 2013 at 7:26pm
	Can't be done. 4 out of 6 cell are irrevocably dead.