I would guess that the one cell has got "old" before the rest . every time you charge the bank it lags behind the other cells and becomes less and less charged.It will die if its voltage gets much below 1.6 volts. Have you tried an equalizer charge ?
Chris S --- In electricboats@
>
> I'm still tracking down a gremlin in my battery pack and have a strange one.
>
> One of my batteries reads a more-or-less normal voltage. But a specific gravity test reveals 1 cell which is basically water. How can that happen? I moved some electrolyte around between cells and it gave a brief improvement in total voltage.
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> Is this a short? I thought that would drop total voltage?
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> Could it be a cell-reversal? That should lower voltage too, right?
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> Why is the voltage near-normal (open-circuit reading 12.14 after 25AH discharge)
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> the cell-to-cell voltage is also erratic.
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> Basic symptom that started it all is that this battery is 1 of 2 in the pack that show lower-than-normal voltage after a moderate discharge.
>
>
> Any help from the battery wizards appreciated.
>
> -Keith
>
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