Shopping for marine batteries can be a complicated task if you aren’t sure of just what you need. Understanding the type of battery you require and which options are best for your use and your boat will be critical in making your selection.
If you have access to your current marine battery note the manufacturer and, if possible, any information about the series or model of battery. These batteries will be 12 volt, if it is used for starting your engine, or they may be deep-cycle batteries if they are used to run your trolling motor or other electronic accessories on board.
Cranking Amps
Cranking amps, or marine cranking amps, are the rating that marine batteries have to show how much power they can provide to start the boat. This rating is determined by the power the battery can generate which in turn is dependent on the number and thickness of the lead plates with the battery case.
It is important to know what MCA rating that the boat engine manufacturer recommends. Choosing a battery with a lower rating may not cause an immediate problem but computerizes systems and some sensors may not work properly or may give you signals of engine problems.
These specialized starting marine batteries are really just for that. They allow the boat engine to start and then the boat runs off the alternator while the battery recharges. Using these marine batteries instead of deep cycle batteries will simply not work for long.
Deep-Cycle Batteries
In some ways the deep-cycle batteries are the true workhorse of marine power. They are designed to provide constant, steady low levels of power over long periods of time. They have reserve capacity or RC rating that is important to check. The higher the rating the longer that deep-cycle marine batteries can last between charges.
Within these two categories of marine batteries there are different variations. They can be wet cell, which is the most common, absorbed glass mat or AGM, or they can be gel batteries. All are effective for use on the water but they also have their own pros and cons.
Typically wet batteries are the lowest cost and very dependable, gel batteries are more costly and more difficult to recharge, and AGM batteries are more costly but also much more durable than either option. Talking to your battery supply retailer is a great way to learn more about the different options in marine batteries.
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