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says...

I have two "maintenance free" sealed batteries. Yesterday when I
checked the battery trays where the batteries are secured in place, I
found that both battery trays are quite wet (like 1/16" deep). This is
odd. The batteries are inside a compartment that is protected from
elements, and the rest of the compartment is completely dry -- only the
battery trays are wet. I am sure the water is not from the air because
the air in early winter is relatively dry.

Hmm, seems likely that it is condensed battery electrolyte. They are
hooked up to a charger, yes?

jps wrote:
Moisture condensation from heating a cooling of the battery during
charge cycles?

Possible

Did you test to see whether the liquid was electrolyte? I little
splashed on your best jeans will tell you within a couple of hours.

A better test is to drop a pinch of baking soda in it.

BTW you should mix up a solution of baking soda in distilled water and
use it to wipe down the area around your batteries. You'd be amazed at
what that stuff gets on, and it is very corrosive.

Fair Skies
Doug King