Catalina Capri 22 Owner's Manual page 28

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DISCHARGE STATE:
Leaving a battery in a discharged state for any length of time can also result
in a permanent loss of capacity for the battery. Doing so, in cold weather,
can destroy the battery, since it will freeze at relatively low temperatures.
CLEAN CONNECTIONS:
Keep battery connections clean and tight. A cupful of strong baking soda
solution and a toothbrush will clean corrosion from the terminals and
neutralize any spilled acid. (Do not allow any of the solution to enter the
battery cells.) A coating of petroleum jelly on the battery terminals will
inhibit corrosion.
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