It is interesting that you say 'battery' in the singular.
Is this a heavy square wet battery (lead acid), or a lightweight battery. A lot of sail boats use a battery hold that holds 4 small batteries (AA). This weighs very little and is usually good for up to 8 hours sailing, depending on battery type, size of winch, and windspeeds.
If it is a big heavy battery, this can easily be swapped out.