That's good to know.

Not hijacking the thread: Although my water/electrolyte level was lowered, the cells were wet up to the caps, so I will assume the plates were wet as well. I had no idea I even had a conventional battery -- I thought it was sealed -- and the water/electrolyte level has steadily dropped over the past year. I added about a cupful of water to top off.

In very warm, humid weather, it was not holding a charge as strongly as it should and I was preparing to buy a new one when I discovered the well-hidden, flush-mounted covers over the refill holes (it's an Autocraft Titanium).

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2008 E350 4matic / Black/Anthracite

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Gone but not Forgotten:
2001 E430 4matic, 206,xxx miles, Black/Charcoal
1995 E320, 252,xxx miles, Black/Grey
1989 260E, 223,00 miles, Black/Black