The storage battery is one of the most abused components of an automobile, according to battery manufacturers. This is likely to be also true for the storage battery in a boat. The “normal” life of a battery in a car is three years, but few batteries lead the “normal” life. They are, to mention some abuses, overcharged or undercharged, lack proper fluid levels, are left unattended for long periods, and become corroded. With proper care, however, a marine battery should last longer than the automotive battery because of its heavier construction. And, five years is not unusual for the lifespan of a marine storage battery, providing it has received proper care.
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