If you use an automotive type charger it is critical to disconnect the battery cables if the boat is in the water. Many of those chargers will connect the AC to ground and may cause stray current corrosion. This does not matter in a car or disconnected battery but with everything hooked up in a boat you don't want AC on the ground system.
If you have an inverter that will use some small current when not powering anything. The best solution si always disconnect the battery terminals for long term storage.
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