Overcharged battery question

Ray

Well-known Member
I bought a new Schumacher battery charger a few months ago.I probably charged 8 or 9 batterys and it worked fine. I decided to put some extra charge in my 1972 model 4020 batteries. So,I set the timer for an hour and went home.It was a couple days later when I returned and the battery charger was still running. By that time it had cooked the acid out of both batteries.Napa wants 50 bucks for for the battery acid. I don't know if that would bring them back alive or should I just get two new batterys and be done with it.
 
my thoughts are that someting more then the timer went bad,,definetly too much chargegoing into those 2 batteries if it cooked all the acid solution out in 2 days.when the charger had the bwtteries at full charge the regulater in the charger should of kicked the charge down to a trickle. the plates in the batteries may have been damaged from the heat..
 
The water is what gets evaporated out of the batteries. Used to get dry charged batteries new and just add acid. You can use distilled vinegar it will do the job.
 
I tried the new acid, but that didn't work.Ended up with two new batteries.
 
I would be double checking that charger
I had a friend left his bat charger timed on a Jd M
Charger didnt kick off
Battery blew up
Burnt his M
Burnt his 4320 , 7720 combine and shop
It was an expensive battery charger
 
I learned years ago to NEVER depend on those timers. You set them and then come back to make sure it goes off or you set it for the 2amp charge and not worry. I have a charger that one time I set it, it works then the next time I set it and an hour latter it has not moved any
 

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