What is a Marine Battery?
Marine batteries tend to come in two battery types, either to start a marine engine or for powering the domestic electrical systems. The domestic batteries supply power over a period of time and they perform best under slow drain situations, as a power source for appliances and equipment in many boats, watercraft and vessels. Where marine starting batteries are concerned, these are primarily designed for starting marine engines, producing a high burst of power in order to start the engine. Marine domestic batteries are used to provide a power source to the electrical equipment and appliances on board, these are charged either when the engines are running through the onboard charging system, or when the vessel is moored and hooked up to the marina main power supply.
Within the marine and leisure battery ranges you will come across ‘Dual Purpose’ batteries, these batteries have the ability to supply power over a period of time for your electrical appliances (as mentioned below), as well as having the ability to provide cranking power which can start marine engines.
Marine domestic batteries, supply a steady source of power over a prolonged period of time for onboard equipment such as: computers, sensors, bilge pumps, heating, aircon, lights, fridge, kettle, television, to name a few. Marine batteries offer the ability to make sure you have the power needed for when you’re out at sea or inland waterways when you’re away from a mains power source for charging. Making your boating experience and surroundings a more comfortable environment.
Most traditional marine batteries are lead-acid batteries, we will explain the different technologies of lead-acid batteries below. A more modern technology, ‘Lithium’ LiFePO4 batteries are becoming more and more popular with anyone who requires a power source for starting marine engines or powering equipment and appliances onboard, far more efficiently than before.
Lithium marine batteries are becoming so popular because they have almost none of the disadvantages of traditional lead-acid batteries, which we will cover in the Lithium section.
Marine Battery Technologies
Most traditional marine batteries are lead-acid batteries, we will explain the different technologies of lead-acid batteries here and help you decide which technology best suits your needs.
Wet Flooded Batteries
Lead-acid batteries which are cheaper than AGM, Gel or Lithium batteries, providing a reliable low maintenance power storage solution making them a popular choice for powering your onboard equipment. There are two main types of wet marine battery, maintenance free, which is sealed so you can’t access the inside to check electrolyte (acid) levels. The other type is open, which means you can access the inside of the battery where you’ll check the electrolyte levels during your battery maintenance schedule.
As with all wet batteries, sealed or not, they need to be handle with care due to the acid content and kept in an upright position.
Rule of thumb: The more plates which a cell contains, and therefore form a larger surface, the larger the cold start power (CCA) which the battery can deliver for engine starting. However, if the space in the cell is used for fewer, but thicker plates, the cycle stability is increased. This means that the battery is designed for a higher charge throughput (continual charging and discharging process) as would be used in marine domestic batteries.
The cells are contained in a casing which is made from acid-resistant plastic (polypropylene). Early batteries had screw plugs which enabled them to be topped up with distilled water. Modern batteries are completely maintenance-free. Water does not need to be, and must not be topped up. Although AGM batteries still have “one-way plugs”, these must not be opened under any circumstances.
AGM Batteries
AGM, or Absorbent Glass Mat batteries feature a fibreglass matting which surrounds the lead plates with the electrolyte absorbed within it. AGM batteries are spill proof (and so can be theoretically mounted in any position) and have far better vibration resistance than a standard lead-acid battery.
The major benefits with AGM batteries are their ability to withstand a greater number of charging cycles and are better able to deep cycle, making them more reliable and capable of a much longer lifespan (for various technical reasons) than their wet counterparts.
Lithium Batteries
As mentioned previously, Lithium batteries are becoming far more popular and our extensive Relion range of Lithium batteries can cover all of your Lithium requirements. One of the reasons why Lithium batteries are so popular is that they have virtually none of the disadvantages of your traditional lead-acid batteries.
Here are some of the reasons why people are making the switch to Lithium batteries:
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Lithium Benefits For Marine
Sailors, cruisers, racers and anglers want to spend as much time on the water as possible. Long lasting Relion Lithium Iron Phosphate (LiFePO4) batteries fit all types of watercraft and deliver the dependable power for everything you need, from onboard appliances, navigation equipment and sound systems to supporting off-grid living and adrenaline packed racing.
Relion Lithium batteries are built to last and designed to perform, making the perfect energy source to power your aquatic adventures. Lightweight, durable and maintenance free, our batteries charge quickly, store safely, and withstand the harshest temperatures and conditions.
Why Choose Lithium Batteries For Your Sailboat?
Long days of adventure call for long hours of power, and sailboats have numerous components that require serious energy. Having reliable deep cycle power that can meet these extensive demands is crucial. Relion Lithium sailboat batteries offer a solution to these needs as they provide tremendous capabilities for those moments when you’re away from it all.
Upgrading To Lithium, Is It Worth It?
Sailing Nandji made the change from AGM lead-acid batteries to Relion Lithium batteries. In the below video they explain why they made the change and provide you with information comparing the two types of batteries.
Off Grid Living, Why We Chose Relion Lithium
The Wynns have been living off lithium battery power for the past couple years and it has completely changed their off-grid lifestyle. Watch their video explaining why they chose Relion Lithium and why they feel it’s a better investment than going for lead acid batteries.
Pro Series Angler Explains Why He Uses Lithium Batteries
As an angler, your time on the water is your most valued asset. A bass boat needs reliable marine batteries as they are necessary for both starting and running your fishing machine. Shorter charge times and more usable capacity without any late-day voltage sag means you can spend more time chasing that fish of a lifetime.
