On Sun, 18 Dec 2005 00:21:27 GMT, Charlie Brown
wrote:

My three batteries have good ventilation. Two are under the console
which has a 16" square opening and the aft battery also sits beside a
similar sized opening.

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You should be OK, just take some simple precautions:

Hook up the charger at the battery before plugging it in to avoid
sparks at the battery terminals.

This one may seem obvious, but take care to keep water away from the
charger and vice versa.

Take the charger off the boat when not in use and don't leave it
hooked up unattended for long periods of time. I know of several boat
fires that have started from portable chargers.