> I don't see the point in
> disconnecting the battery; it's an open circuit when the
> ignition is off.
Not that you asked, John, but here again there is kind of a point : Just
like the dirt on top of the battery that you mentioned, it's not unusual for
the wiring, etc. to leak a small amount of current due to dirt and whatnot.
Disconnecting the battery just slows it's discharge, possibly by quite a
bit.
My old motorhome leaked about 20ma in damp weather ... problem was
eventually traced to dirt around a particular connection underneath the
body.
Randall
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