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Originally Posted by Al Skierkiewicz
Gene,
I will test our batteries, I have a CBA battery analyzer from Mountain Radio. I know that there was a manufacturing defect in some batteries last year. When discharged, at some point in time the output voltage suddenly dropped by 1.2 volts. Then later there was another sudden drop. Indication was that cells were shorting or of vastly reduced capacity. I will post when I know more. There should be no reason for a 50% difference between production runs.
Dale, I have to take issue with your methodology. The load testers are for short term testing. When you load to capacity over a long period of time the resistance changes with temperature. It is possible the load testers were changing value to a lower resistance.
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We were not seeing sudden drops when we did our testing and our load was a constant current. We will pull the tester out of the attic in the next week or so and check all of our batteries for this year. It will be interesting to compare notes...