Marine Batteries & Accessories

Brands in this category

SIMARINE is a young company run by an enthusiastic team that strives to develop and produce advanced marine and caravan electronic devices. They always attempt to set new standards in fields of design, functionality, connectivity, and ease of use. Their goal is very simple - to bring instruments closer to the users. All of their products are designed with that in mind. They truly believe that good instruments should benefit the users. There are better things in life than studying user manuals for countless hours.
Discover all SIMARINE products now
Blue Sea Systems has over 1,000 electrical components for your on-board electrical system. In addition to use in the shipping industry, the tried and tested and extremely resilient components are also used in all kinds of utility vehicles (e.g. US police or fire brigade). SVB offers Blue Sea components for battery management / voltage monitoring / display instruments (voltmeter / ammeter), switches and switch panels, contacts and insulators, fuses and accessories as well as plugs and sockets. The large product range, rapid availability and worldwide sales network have made Blue Sea Systems a leading supplier of on-board electrical components since 1992.   
Discover all BLUE SEA products now
VICTRON Energy is one of the world's best-known manufacturers of devices used in battery and charging technology, as well as self-sufficient power supply, with a wide range of high-quality products. Their reliable devices are used in the maritime and caravaning sector, as well as industrial applications. 
Discover all VICTRON products now
Logo Mastervolt
The power to be independent! MASTERVOLT offers you new innovation, with extensive know-how. The company strives to expand the possibilities of electrical systems and component technology to their furthest potential. Each MASTERVOLT product has a long service life and optimum performance!
Discover all Mastervolt products now
Logo Vetus
VETUS is a developer, manufacturer and commercial enterprise for marine engines, generators and technical equipment on board of pleasure craft and small commercial vessels. The company was founded in 1964 by Dutchman, William Henry den Ouden.
Discover all Vetus products now
The right battery for your boat. SVB supplies various types of marine batteries for your boat. The demands on batteries used on boats are extremely high, which is why you can also use these batteries in recreational vehicles, camping and caravans without any problems. Marine batteries must be able to withstand being subjected to inclinations, be resistant to vibration, preferably non-gassing and have a low self-discharge rate. Learn more about Batteries & Accessories...

Marine Batteries

- Power on the water -

Why is it so important to have a heavy-duty marine battery on board?

A marine battery is the most important electrical component in your on-board power system. When the engine isn't running and there are no other energy sources such as wind generator or solar panels available, the marine battery is therefore the only energy source to supply power to consumers in the on-board network. Since most boats and yachts are equipped with extensive, high-quality electronics, a complete battery failure is a veritable maritime emergency.

What types of boat batteries are available for use on board?

The types of marine batteries available are just as varied as their intended use.

Boat engine starter batteries

Batteries for starting the boat engine, also known as starter batteries or car batteries have to provide high current for a short time. Only a small amount of energy is drawn during the starting process and quickly recharged when the engine is running.

Boat consumer batteries

Batteries that are used to provide power to electrical consumers (lights, navigation instruments, fridges, etc.) are known as consumer batteries or 'house' batteries. In recreational vehicles or in caravans they are also called leisure batteries. Consumer batteries for boats are used cyclically. This means that they are regularly discharged more than a starter battery. They have a greater depth of discharge, also known as DOD.

Bow thruster & winch batteries

A bow thruster or winch battery supplies power to the bow or stern thruster or the winches on board. It has to provide a lot of power at short-duration and is therefore comparable to a starter battery. As the running times are longer with bow thrusters or winches than with starters, more energy is drawn from bow thruster/winch batteries. Bow thruster manufacturers define a minimum capacity that should be maintained.

Batteries for electric outboard engines
Electric outboards require no fuel and are powered by a rechargeable battery.

Boat batteries for multiple applications

There are cases where there is no separate bow thruster battery or winch battery. In these instances, the bow/stern thruster or winch is connected to the boat's consumer battery. In other cases, bow/stern thrusters or winches are connected to the boat's starter battery. This must of course be taken into account when selecting the type of battery and battery capacity.

What different technologies are available for marine batteries?

Nowadays a distinction is made between lead acid and lithium technology for marine batteries.
Lead-acid batteries include traditional serviceable (flooded) and maintenance-free (sealed) wet batteries with liquid electrolyte (water-diluted sulphuric acid) as well as gel batteries and AGM batteries.

Lithium batteries have been tried and tested for use in small consumer appliances and power tools due to their high energy density and low weight. They are now also available as high-performance batteries based on lithium iron phosphate (LifePO4) and lithium nickel manganese cobalt oxide (LiNMC) technology. 

Which marine battery is the best choice for my boat?

Maintenance-free lead/acid wet batteries - Ideal as bow thruster/starter or consumer battery

The wet batteries available from us are maintenance-free. Thanks to their lead alloys and sealed housing designs with a pressure relief valve, the batteries have such low water loss that they carry enough acid for their entire life cycle. If excess gases are produced during operation or charging, these can escape through the valve via a small vent in the upper part of the housing. Maintenance-free marine wet batteries tolerate greater heels/slopes without acid leakage. Nevertheless, they should be placed in an acid-proof battery box and in a well-ventilated location. Our maintenance-free marine wet batteries can be used as starter/bow thruster and consumer batteries. To prevent premature battery wear, a discharge depth of ideally 35% to a maximum of 50% should be maintained. A deep discharge can lead to irreversible damage.

Gel batteries as consumer batteries

Gel batteries belong to the group of Valve Regulated Lead Acid (VRLA) batteries with a completely closed housing, in which the battery acid is thickened with kieselguhr. The gases produced during operation recombine to water inside the housing of the boat battery. Gel batteries are extremely low in gassing, leak-proof and can be used in boat or vehicle interiors regardless of position (but not overhead). There is no loss of capacity due to acid stratification/separation. The electrochemical processes in GEL batteries are not as efficient as in wet batteries, they have a higher internal resistance, with the advantage of very low self-discharge and very good storage capability. However, they are less suitable for providing high currents for short periods of time, for example to start the engine. Therefore they are ideal consumer batteries. The recommended discharge depth is 50%. Occasional deeper discharges are tolerated, but are at the expense of service life. A total deep discharge will also ruin a GEL battery.

AGM batteries as bow thruster, consumer or starter battery

AGM (Absorbent Glass Mat) is the most modern lead/acid boat battery variant, in which the battery acid is bound in a glass fibre mesh. Like gel batteries, they have a completely closed housing and are also valve-regulated, absolutely leak-proof and low-gassing, shock and vibration-resistant, can be mounted and operated in any position (except overhead) and have a low self-discharge rate. Compared to the GEL battery, the electrochemical processes in AGM batteries are much better. AGM has a lower internal resistance. This means that an AGM battery can absorb larger charging currents and also emit larger consumption currents. AGM can be used both as a consumer battery and starter or bow thruster battery. The recommended discharge depth is 50%. Occasional deeper discharges are tolerated, but are at the expense of service life. More than 80% discharge will cause irreversible damage. "Deep Cycle" AGM batteries are optimised in design and can be discharged regularly more than 50%, but never more than 80% (observe manufacturer's instructions!).

Customer Ratings & Reviews

All reviews (104.561)
User profile icon

Hay J. on 08.08.2020

Happy with SVB. Also good return services!

User profile icon

Kari B. on 07.08.2020

Thank you -- again -)

User profile icon

Juergen C. on 28.07.2020

SVB is and was always a very reliable address, very recommendable

SVB uses cookies to make your shopping experience as easy as possible. By using our site, you agree to us using cookies. Find out more...  Ok