by 
The Curious Bag
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Marine batteries power boats and watercraft equipment. A dual purpose marine battery offers a compromise between the two main types of lead-acid batteries, allowing for greater operational versatility.
Types
Starting, deep cycle, and dual purpose are the three main kinds of marine batteries.
Fact
Dual purpose marine batteries combine the instant power of starting batteries with the long-term energy delivery of deep cycle batteries.
Function
Dual purpose marine batteries create powerful crank amperage to start a boat's engine while still maintaining enough low amp draw to operate electronics and other auxiliary equipment.
Benefits
When space is limited, a dual purpose marine battery can be the ideal choice, providing the benefits of two batteries in one.
Considerations
Even though dual purpose marine batteries can do the work of both starting and deep cycle batteries, it's best to be as specific as possible when selecting a marine battery. Different boats have different needs, and a dual purpose battery may not meet all power requirements.
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