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(ET) Battery Question



Why would a fully charged pack check good one 1 day, then have a shorted cell in one battery the next?
I just replaced a battery with a shorted cell on a Monday.  The pack is charged by a Landis controller.
The next day I ran a load test on each battery and they were about 6.53 volts at a 50 amp load.+ or - .03 volts.
The 3rd. day they checked out the same.  On the morning of the 4th. day another battery had a shorted cell?
The tractor was run for about 15 minutes on the first day only.  This is nine batteries in about 3 1/2 years.
Eight of them a shorted cell.  Its costing me more for batteries then the cost of running my gas tractor at my
rental property. 

Ralph Vogan
ralphgv talkamerica net

My ET Page
http://members.talkamerica.net/ralphgv talkamerica net/Index.html