What is MCA on a Marine Battery?

Sometimes, we use devices, gadgets, and equipment without knowing basic information about them. Understanding some things might be the key to how we can preserve the longevity of our equipment or gadgets. Or better still, prevent them from damaging or causing damage.

You might have heard about MCA on marine batteries and wondered what they mean.

Marine Cranking Amps or MCA is a rating system for calculating a battery’s output in a short time at a minimum temperature of 32 degrees Fahrenheit. It’s crucial for starting the engine since it refers to how much current a battery can deliver for a brief period. We will see more about MCA, discuss its significance, and discuss how to select a battery with the appropriate MCA for your requirements.

What is MCA?

Marine Cranking Amps (MCA) rating is the measurement of a battery’s ability to deliver amps while sustaining a minimum voltage of 1.2 volts per cell for 30 seconds at 32 degrees Fahrenheit.

What is MCA on a Marine Battery?

Starting (also called cranking) batteries that generate a lot of power in a short period. They are the sprinters of your boat’s electrical system and the engine’s starters. The architecture offers the electrical thrust required to switch on motors. Typically, that thrust is expressed in cranking amps. This starting power is measured by the Marine Cranking Amp (MCA).

Consider your boat’s motor’s cranking requirements when selecting a starting battery. It is suggested that you pick a battery with more power than your engine requires.

What is the Difference between an MCA Battery and a CCA Battery?

In simple terms, MCA measures the performance of a battery in a mildly cold temperature (an average of 32 degrees Fahrenheit). In contrast, CCA measures the performance of a battery in extremely cold weather. The two are rated differently, which is the fundamental distinction between them.

Cold Cranking Amps (CCA) is similar to MCA but refers to a battery’s starting power at 0 degrees Fahrenheit.

The chemical process that a lead-acid battery uses to generate power moves more slowly at colder temperatures than it does in warmer ones. For this reason, it’s critical to have a battery with a high CCA rating; a higher CCA means the battery can generate more amps. And this means the battery has a higher possibility of starting your engine in cold weather. 

Choosing a battery with a CCA rating higher than the minimum rating required for your boat is better if you reside in a region with extremely cold weather. If you do this, you will have the greatest chance of starting your boat engine in cold weather.

A marine battery’s MCA rating measures its power at 32 degrees Fahrenheit. MCA ratings are one-third higher than CCA ratings. If two batteries have different MCA and CCA ratings, you can compare them by multiplying the CCA value by 1.3 to get the corresponding MCA rating. To obtain the comparable CCA rating, multiply the MCA rating by 0.77. 

How Can I Preserve My MCA Battery?  

How long your battery will last depend on how you maintain it. If you want your battery to last long, then you need to keep it in optimum condition.

The following tips are some of the ways you can preserve your battery:

  • Steer clear of severe temperatures. Both hot and cold temperatures might shorten your battery’s lifespan. So, if possible, keep your batteries in a dry, cold environment.
  • Always keep it charged. A battery will last longer if it is charged regularly. Therefore, even if you aren’t using your battery, charge it frequently.
  • Observe the manufacturer’s guidelines. Adherence to the manufacturer’s directions for your particular battery is crucial because every battery is unique.
  • Keep batteries dry, clean, and cool. Make a paste of baking soda and water to remove corrosion.

If you take proper care of your battery, it will last for the amount of time recommended by the manufacturer and will enable you to relax and enjoy your time in the water.

Which one is better? Higher or Lower MCA?

Since MCA measures the starting power, the battery will have more starting power when it has a higher MCA. You will need a battery with a high MCA if you live in cold weather or if you own a boat with a powerful engine.

Of course, MCA is only one aspect to take into account when selecting a battery. You should also consider the battery’s reserve capacity or how long it can function without recharging. So, a battery with a higher MCA is better.

What to Consider before Buying a Marine Battery

It takes more consideration than you may expect to choose the best battery for your boat. In the long term, making a wise choice today could save you money and trouble. Here are some things you should consider before buying a marine battery:

  • You should first consider the purpose of the battery you want to buy. Do you need a battery merely to start the boat or also to power all of the power-hungry devices on board? Or possibly both. Answering this will determine whether you need to get a starter battery or a Deep Cycle battery.
  • The size of the battery is the next factor you should think about. Make sure the marine battery you purchase will suit your boat because these batteries come in various sizes.
  • Of course, you also need to consider the price of the battery. Marine batteries come at different prices. However, please do not buy a battery because it is the cheapest. Oftentimes, batteries with better quality are more expensive. So, go for a battery based on your demands and budget.


In summary, the Marine Cranking Amps (MCA) on a marine battery refers to the amount of power the battery can supply to start the engine.

You should pick a marine starting battery with the right amount of power for your engine if the battery’s purpose is to start the engine. The higher the MCA of a battery, the more power the battery will have available to start the boat engine.

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