![]() Consult all three rankings when searching for a dual-purpose battery. For starting batteries, focus primarily on the marine cranking amps. When shopping for a deep cycle battery, you'll want to pay the most attention to the ampere hour rating and reserve capacity. Marine batteries are rated by their ampere hour rating, reverse capacity, and marine cranking amps. Replacing Your Boat's BatteryĬonsult your boat owner’s manual or a marine dealer when replacing a marine battery, and be sure to buy a new battery that is a good match for your boat. The rest of your electrical and charging systems may need some attention as well, as something other than the battery itself may be the cause of the problem. Just because it’s gone dead once or twice doesn’t necessarily mean it’s no good. The best way to be sure your battery is still good is to have it “load tested.” Most auto parts or battery specialty stores will load test your battery for free and tell you if it’s still serviceable. Yes, a deep cycle battery can be used to start your motor in a pinch, but a two- or three-battery system is highly recommended to separate the engine battery from the accessory (house) batteries. The cranking battery has more yet thinner plates to give a fast voltage spike to crank an engine, but is not intended to maintain high power output for long periods. The longer, higher amperage requirements of trolling motors and windlasses, for example, would heat and distort the thinner plates of a normal cranking battery. A deep cycle battery is constructed differently than a cranking battery, with thicker, heavier plates. A deep cycle battery is only meant to be used where high rates of discharging and re-charging occur often. If you have an electric trolling motor, thruster, windlass, or other battery powered accessories that draw larger amounts of current, you’ll want a separate deep cycle “house” battery for that purpose. While they're able to perform the tasks of a starting battery and deep cycle battery, they're not as efficient as separate batteries.
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