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You add water until the electrolite just touches the lip you see.
If you shine a light into the cell, you will notice that the low electrolite surface looks flat. When the electrolite touches the lip, surface tension causes the electrolite to form a cup-shaped surface.
This sudden change from flat to cup-shaped is easy to see, and is used by most battery manufacturers.
I like to charge the battery whenever I add water.
I have had little luck with batteries that show a deep drop in electrolite level, don't be too surprised if you have a battery failure in the near future
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3 8s & 2 7s 725,000 miles total
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