There is a simply check to see if one cell in the battery is shorted. Remove the cell caps if you can, and turn on the charger to about 10 amps. If one cell is not bubbling or barely bubbling than that cell is becoming shorted. Also this shorted cell will have no water loss as compare to the other cells.
If one cell becomes fully shorted, then the other cells are being overcharge to make up the difference of the full voltage of the cell. Another thing that normally happens as the battery ages, is the built up of SO4 off the negative plates and the O2 off the positives plates and some lead that is thrown off by high ampere discharging and charging that settles to the bottom of the battery until it shorts the bottom of the plates together. I use to work in a battery shop which use a clear container cells where we can see this happening. At that time, we can pull the tops and plates out of the cell, clean the plates in a sonic cleaning tank, replace the separators as needed and add new electrolyte with the same specific gravity that was taken out. It was common to get 15 years or more out of these batteries. Roland In my 12 volt deep cycle accessory battery that has now been running for 13 years had one cell that is becoming shorted about a year ago and a week ago become full shorted. There was no bubbling and the water level was higher than the other cells. I knew when the DC-DC converter was pulling a higher ampere, than it was time to change it out. Roland ----- Original Message ----- From: "Cliff" <[email protected]> To: "ev list" <[email protected]> Sent: Tuesday, March 19, 2013 6:57 AM Subject: [EVDL] flooded lead acid battery voltage goes down from morecharging? > Hi, > > My 48 volt utility vehicle has 6 8V Crown brand deep cycle batteries > CR-190, 190 ah at 20 hour rate. The vehicle is in regular use, no deep > discharges, and recharged by a three stage DeltaVolt charger. > > I have been noticing that after disconnecting the charger and letting the > batteries rest 12 hours that 5 out of 6 batteries were 8.510 to 8.577. The > other battery was consistently around 8.414 volts. I tried an equalization > charge of 7.5 amps constant current. I ran the equalization charge for 8 > hours. The battery got warm but did not use much water. After 12 hours off > charge, the voltage read 8.3. > > Did I damage the battery? Did I quit too early? Any suggestions? > > Thanks > > Cliff > > www.ProEV.com > > > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: > <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20130319/ad07a26c/attachment.htm> > _______________________________________________ > UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub > http://lists.evdl.org/listinfo.cgi/ev-evdl.org > For EV drag racing discussion, please use NEDRA > (http://groups.yahoo.com/group/NEDRA) > > _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org For EV drag racing discussion, please use NEDRA (http://groups.yahoo.com/group/NEDRA)
