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Routine maintenance for lead-acid marine battery banks—including AGM, gel, and flooded cells—requires periodic physical inspections and consistent charging habits to prevent premature failure. Owners should inspect battery terminals for corrosion and check bolt tension at least annually, or every six months for boats frequently subjected to heavy seas.1:48 To avoid sulfation, which occurs when lead-sulfate crystals harden on battery plates, lead-acid banks must reach a 100% state of charge at least weekly.3:14 When under load, discharging a bank below 12.2 volts significantly reduces its lifespan.4:24 For wet-cell batteries, periodic equalization using a compatible shore power charger or solar controller helps dissolve sulfation, provided the electrolyte levels are topped up afterward.7:04 If a single battery in a bank fails, it must be replaced with an identical unit of the same age and type to prevent the new battery from degrading prematurely.12:20 Monitoring daily voltage patterns helps identify external system faults, such as a malfunctioning freezer thermostat, before they cause permanent battery damage.13:53

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