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Marine Batteries

Marine Batteries

The right battery for your boat. There are various types of batteries that are available for the use in and on your boat. But which battery type is the most suitable for your yacht? What is important to know when you buy a battery? Find out more! 
There are various types of batteries that can be installed on a boat. However, not every type is perfectly suitable for the use on the water. Here we present you an overview of the three main battery types and their function, advantages and technical details.   
Gel batteries
Batteries that are filled with gel and the acid is totally embedded in this gel. This makes the battery maintenance-free and the cases are completely sealed. Gel batteries are absolutely tip-over proof and can be installed in any position on the boat. No need to be afraid of hydrogen gas which makes the installation in the interior of a yacht very easy and safe.
Gel batteries are extremely shock resistant, leak-proof, relatively insensitive to deep discharge and have a very low self-discharge rate. The cycle stability for gel batteries is indicated at around 400-500 cycles. When used in normal board operation and proper handeling, in a life expectancy of more than 7 years. Gel batteries are excellent as consumer and service batteries on board. Duo to the lower cold start current, gel batteries are not perfectly suitable as starter batteries, and have to be purchased in more powerful versions accordingly.
AGM batteries
AGM batteries maintenance free battery type for use on boats and in mobile power supplies. Because of their closed design, these batteries are leak proof and can be operated in virtually any position. AGM batteries are far more efficient, robust and at the same time more economical than conventional batteries. Due to their particular structure, AGM batteries are able to dispense high currents in a short time and regain them quickly back again. The very low internal resistance of this battery allows for much faster charging with high currents. The charging times are up to 80% quicker when compared to other battery types. This makes AGM batteries especially useful for use on yachts and mobile power supplies. The cycle lifespan of AGM batteries is roughly comparable with those of gel batteries, providing 300-700 (or even higher) cycles, depending on the model.
Lead acid batteries
Conventional batteries that are commonly used in the automotive industry as a starter battery and are designed for delivering high currents in short time. These batteries arefileld with sulfuric acid and are not leak-proof. These batteries are therefore not fully  recommended for use on boats and yachts. During charging, highly explosive hydrogen gas may arise and this is why these batteries should always be installed in areas with adequate ventilation.
Any questions? Whether to choose Zenith or Exide  whether AGM battery or SMF (sealed mainenance-free). Your SVB professionals are happy to help you!
more Information
Professional Deep Cycle AGM Batteries
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Marine Batteries
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-35%
AGM Batteries
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Gel Batteries
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EXIDE Gel Batteries
279.95 EUR from €279.95
HeavyDuty / Deep-Cycle AGM Battery
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-47%
AGM Battery
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-29%
ZENITH AGM Battery
179.95 EUR €253.99 from €179.95

Dry - Batteries

Li Button Cell / LR 44
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Li Button Cell / LR 43
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-37%
Li Button Cell / LR 43
1.00 EUR €1.59 only €1.00
Battery 9V block / 6LR 61
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Battery MONO / LR20 / D / Set of 4
Product image of Battery MONO / LR20 / D / Set of 4
Battery BABY / LR 14 / Set of 4
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Battery MIGNON / LR6 / AA / Set of 4
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Batterie MICRO / LR 3 / 4er Set
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Rechargeable battery Type 18650 / 2600 mAh
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PANASONIC - Li-Batteries 3 V / 1400 mA / 6 pcs
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High Performance Alkaline Batteries
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EBL Replacement Type C Battery / R14 / 5000 mAh
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Battery Tester
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Battery Tester
6.50 EUR only €6.50

Battery Accessories

Battery Boxes
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Battery Box / black
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Universal Anti-Slip Mat with Strap
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Battery Terminal with Connectors / M8 / M6
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Battery Terminal with Distributor / M10
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Bluetooth Battery Monitoring System
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INTACT BATTERY GUARD Bluetooth Battery Monitor
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Battery Boxes
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Battery tester
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SC4 Battery-Pole Clamps
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SC4 Battery-Pole Clamps
29.95 EUR only €29.95
Battery Terminals / Standard
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Power Battery Terminals
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Power Battery Terminals
19.95 EUR only €19.95

Marine Batteries


A battery's lifespan
A very common question we are asked is how long a battery will last and what is the maximum life span that can be expected. The life of a battery is substantially defined by the number of charging and discharging cycles. A cycle is defined as the following: Discharging a battery to 20% capacity and then recharging it back to a 100%. If the battery is only discharged to 50% and then fully recharged, it is half a cycle. Depending on their design and construction, the on-board batteries have a certain number of cycles and thus an appropriate life expectancy. 
 
car battery is designed to last about 50-80 cycles.
This sounds very little, but in practice it is more than enough. While a very high current is required to start your engine, the start-up only takes a very short time - resulting in only 0.0001 cycles. This means that the engine can be started between 50,000 and 80,000 times. The life expectancy of AGM and gel batteries is estimated at about 300-700 cycles. That means, if the battery is only 50% while dis- and recharging, the result are 800 to 1000 cycles. While dis- and recharging at 25%, the result are 1,600 to 2000 cycles. Therefore, when used in normal on-board operations, batteries can have a life span of around 7 years. After reaching the stated number of cycles, 80% of the battery's capacity remains. At this point, battery manufacturers consider the battery as used and to be replaced, but this does not mean that you have to replace it. Let's compare it to a diesel tank: your tank is in new condition and has a capacity of 100 liters; after about 7 years, the tank has "shrunk" and only takes 80 liters.

Questions about the warranty come up regularly in connection with the life span of a battery. If a vendor promises a warranty of 3-5 years, this is simply untrustworthy. If the battery ran through a complete charge cycle of about 400-500 charges in the first year due to intensive use, it is basically used up and has done its job. That's like buying a new car and driving over 100,000 km in the first year and then complaining that the tires are worn down.

Care and maintenance of batteries.
Each battery, regardless if it is a lead-acid, AGM or gel battery gets damaged when it is completely discharged and not recharged immediately. In addition, a significant shortening of life expectancy occurs. If possible, don't discharge your batteries completely, a remaining capacity of approximately 20% should always be maintained. In case of total discharge, please ensure immediate recharging of the battery.
AGM and gel batteries do not require any maintenance. However, the connections should be periodically checked and the batteries must be fully charged. All batteries have a certain amount of self-discharge. This amount is so small for AGM and gel batteries that they will even survive a winter break without being connected to a charging device (e.g. Marine battery charger). AGM and gel batteries cannot freeze in winter storage and thus do not need to be removed from your boat in winter.

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