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AmazonBoat batteries often suffer from being left uncharged for long periods of time. Before you begin diagnosis any electrical problems on your boat, be sure to check that your battery is healthy and that it is fully charged.
Test the battery is healthy and capable of accepting a charge
Batteries don't last forever, and their lifespan is significantly shortened by being stored flat or incorrectly charged. If a battery is healthy it can be recharged and used safely, it a battery is unhealthy it will need to be replaced with a new one.
Charge the battery back to full capacity
Be sure to fully charge you battery correctly to both increase its lifespan and also to make sure you have plenty of power when you need it.
A small parasitic current draw is coming out of the battery
If your battery keeps going flat but has tested to be in good health you mostly likely have a problem with the charging circuit or a parasitic draw.