Quote:
Originally Posted by Altavia
Remove the filler from one battery cell and drain such that water in the battery is just above the plates. Re-install the filler, look where the white caps are.
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After following the excellent suggestion above, the photo on the left is the view from the top (white cap on empty and full cells look very similar) and the side (white cap in cell at bottom of photo has dropped down, indicating that the cell needs a fill).