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If you are a boat owner, marine batteries are essential for you. Despite this fact, many boat owners are not adequately informed when it comes to their batteries. They do not know which kind of battery they have, and they are clueless when it comes to charging.

That is the reason why today we have decided to share with a short guide dedicated to marine batteries. There are quite a few things that you should learn about these batteries so let’s get started.

Marine batteries are not that evolved

You should know that the evolution of technology has not helped marine batteries too much. In fact, their battery design remains quite primitive. Marine Batteries have many limitations, and their internal structure is always determined by their use.

Marine battery types

When it comes to different battery types, there are three chemical ones:


Flooded batteries are also known as wet. They are the most common type, and they are very cheap as well. In fact, the price might be one of the reasons why it is so popular because it is significantly less expensive than the other types.

This kind of battery uses a liquid sulphuric acid reservoir, and it is a sort of pathway between lead plates. Then, when the battery is charged, hydrogen and oxygen are produced by the electrolyte. The gas needs to escape the boat, but sometimes outgassing can become a problem. That is the reason why wet batteries need to be continuously inspected.


Absorbed Glass Mat batteries come with glass mat separators. Between the positive and the negative plates of the battery there is acid electrolyte. The oxygen produced on the positive plate will migrate to the negative plate during charging, thanks to the pressure valves. When it comes to maintenance, AGM batteries are basically the best ones, because you don’t have to worry about them.

Additionally, these batteries accept high voltage, up to 40% of the amp-hour capacity of the battery, which is more than the energy taken by the other batteries. Additionally, its self-discharge rate is of 3%. However, for all these benefits the price is also higher.


The gel in these batteries is made out of phosphoric acid, fumed silica, pure water, and sulphuric acid. When you charge these batteries a small amount of oxygen and hydrogen is generated at the plates. These gases are combined into water. This also helps the battery, as it won’t dry during charging. These batteries charge at a lower voltage compared to the other one you need to make sure that your voltage is not too high for these.

What should you know about batteries?

When it comes to marine batteries, it is vital that you choose one type for your entire boat. It is not safe to mix different kinds, and it could have bad results. When a battery is discharged, you should not leave lit like that for an extended period of time.