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Product DescriptionProMariner's fully automatic onboard charger conditions and maintains batteries with a built-in safe maintenance mode. The ProMar1-5 automatically charges and maintains your engine crank battery while distributing all remaining charging amps to trolling motor batteries. 100% epoxy-filled charger is waterproof and shockproof. Prewired for easy installation. Safe for lead acid or gel batteries. Two-year warranty.