[Shop-talk] battery revival

[Dave]

RIP.  :-(

The way a battery works is that the acid etches lead from one plate and deposits it on the other.  Current capacity is a function of plate area.  In order to get high CCA ratings without making the battery e-gantic (or is that gi-normus?) is to make the plates very thin.  so thin that they are supported by a fiberglass mat.  When a battery is discharged lead is etched from one plate and if the discharge is deep enough there will be no lead left in some areas.  Once these voids develop they never fill back in and current capacity is reduced.  Do this enough and there will be little enough plate area on at least one cell to render the battery useless.

I would think that a deep-discharge style battery would be a better choice for this application.  These have thicker plates and tolerate deeper discharge cycles better than cranking batteries.  They do cost more, however, but the penalty is not great.
 

Dave Massey


 

 

-----Original Message-----
From: john niolon <jniolon at att.net>
To: shop-talk <shop-talk at autox.team.net>
Sent: Fri, Jun 23, 2017 2:12 am
Subject: [Shop-talk] battery revival




 
I've got a 12 volt 750 cca Exide battery, probably 4-5 years old and seldom used   It is permanently mounted on my car hauler trailer... runs the winch. I have a 1 amp (I think) solar panel keeping it topped off and occasionally I switch it to the breakaway battery. Probably been 6-8 months since I've used it and when I did.. it died rather quickly... charging would bring it back... but again sagged quickly. The cells were a little low on water but not below the plates... topped them off and put it on a batteryminder maintenance charger... 

I can get it up to 14 volts... but when I put it under load it drops to about 4 it's been on this charger for days 

diagnosis ??? salvageable ??? 

thanks 
john
 

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