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

I don't quite picture how the charging cycle can cause this. But this
might have something to do with condensation. Might be everything in
the compartment were very cold at night, and moisture in the air might
have condensed on the surface of everything in the compartment. The
condensed water might drip down to the bottom of the battery tray and
stay there. On the other hand, the condensation on the other surface
might have dried out through ventilation, or have been absorbed into
the fiberglass shell of the compartment (can fiberglass absorb water?).
That might have explained why only the inside of the battery trays
were still wet. But I am not sure. I am just wondering whether any
one else has this experience?

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.

I am under the impression that electrolyte is acidic. But I didn't
smell anything unusual when I saw the wet battery trays. I actually
used my bare hands and paper towel to dry the battery trays, and I
still have skin on my hand. Therefore, I doubt that those liquid was
electrolyte.

Jay Chan