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 only meant to be used where high rates of discharging and re-charging occur often.Ī deep cycle battery is constructed differently than a cranking battery, with thicker, heavier plates. 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. This is an example of a deep cycle marine battery. 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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