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Under load, take your voltage meter and read from the first battery - terminal to each successive + terminal. Each increase in voltage should be the same for each battery. Anything off by more than .3 volt is starting to deteriorate and should be reconditioned.

0- ____ +6.2 -____+12.4 -____+18.6 -____+24.5-____+30.2-____+36.4
.....#1 ..............#2 .............#3 ...............#4 .............#5...............#6
Battery 4 is marginal, Battery 5 should be reconditioned.


Of course, the difference should be less for smaller voltage batteries and no more than .5 volts for 12 volt batteries. These are just numbers I have come up with empirically. Someone else may have a better reference for the allowable voltage difference between batteries in series.

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15y ago

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